diff --git a/.travis.yml b/.travis.yml
index 74cd5a530f7..bfd2ec93d77 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,6 +18,7 @@ matrix:
         - sudo apt-get update -q
         - sudo apt-get install clang-3.9 llvm-3.9 llvm-3.9-runtime -y
         - export LLVM_CONFIG=/usr/lib/llvm-3.9/bin/llvm-config
+        - export CC=gcc-5 CXX=g++-5
       script:
          - ./mach build -d --verbose
          - ./mach test-compiletest
@@ -37,12 +38,24 @@ matrix:
       env: CCACHE=/usr/bin/ccache
       addons:
         apt:
+          sources:
+            - ubuntu-toolchain-r-test
+            - sourceline: 'ppa:jonathonf/ffmpeg-3'
           packages:
             - cmake
+            - dbus-x11
             - freeglut3-dev
+            - gcc-5
+            - g++-5
             - gperf
+            - libavcodec-dev
+            - libavformat-dev
             - libosmesa6-dev
+            - libpulse-dev
             - libgles2-mesa-dev
+            - libswscale-dev
+            - libswresample-dev
+            - pulseaudio
             - python-virtualenv
             - xorg-dev
             - ccache
diff --git a/Cargo.lock b/Cargo.lock
index 4bfd9d6eef1..b7b2ab2e076 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -586,6 +586,25 @@ dependencies = [
  "syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "cubeb-ffi"
+version = "0.0.1"
+source = "git+https://github.com/djg/cubeb-pulse-rs?branch=dev#864332fde124761da15c444e58889faf598a219f"
+dependencies = [
+ "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "cubeb-pulse"
+version = "0.0.1"
+source = "git+https://github.com/djg/cubeb-pulse-rs?branch=dev#864332fde124761da15c444e58889faf598a219f"
+dependencies = [
+ "cubeb-ffi 0.0.1 (git+https://github.com/djg/cubeb-pulse-rs?branch=dev)",
+ "pulse 0.1.0 (git+https://github.com/djg/cubeb-pulse-rs?branch=dev)",
+ "pulse-ffi 0.1.0 (git+https://github.com/djg/cubeb-pulse-rs?branch=dev)",
+ "semver 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "darling"
 version = "0.2.0"
@@ -787,6 +806,14 @@ dependencies = [
  "x11 2.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "encoding_c"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "encoding_rs 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "encoding_rs"
 version = "0.7.1"
@@ -979,6 +1006,23 @@ dependencies = [
  "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "gecko-media"
+version = "0.1.0"
+source = "git+https://github.com/servo/gecko-media.git#0299b455a062bcbfe038bfd90bb173ad9b98d5c7"
+dependencies = [
+ "bindgen 0.31.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cmake 0.1.27 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cubeb-pulse 0.0.1 (git+https://github.com/djg/cubeb-pulse-rs?branch=dev)",
+ "encoding_c 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 0.2.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mime 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mp4parse 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mp4parse_capi 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "walkdir 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "geckoservo"
 version = "0.0.1"
@@ -1757,6 +1801,14 @@ dependencies = [
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "mime"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "unicase 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "mime_guess"
 version = "1.8.1"
@@ -1809,6 +1861,17 @@ name = "mitochondria"
 version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "moz-cheddar"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "clap 2.20.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syntex_errors 0.58.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syntex_syntax 0.58.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "toml 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "mozjs"
 version = "0.1.8"
@@ -1846,6 +1909,17 @@ dependencies = [
  "num-traits 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "mp4parse_capi"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "moz-cheddar 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mp4parse 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "msg"
 version = "0.0.1"
@@ -2345,6 +2419,23 @@ dependencies = [
  "time 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "pulse"
+version = "0.1.0"
+source = "git+https://github.com/djg/cubeb-pulse-rs?branch=dev#864332fde124761da15c444e58889faf598a219f"
+dependencies = [
+ "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pulse-ffi 0.1.0 (git+https://github.com/djg/cubeb-pulse-rs?branch=dev)",
+]
+
+[[package]]
+name = "pulse-ffi"
+version = "0.1.0"
+source = "git+https://github.com/djg/cubeb-pulse-rs?branch=dev#864332fde124761da15c444e58889faf598a219f"
+dependencies = [
+ "libc 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "push-trait"
 version = "0.6.0"
@@ -2520,6 +2611,7 @@ dependencies = [
  "encoding_rs 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.15.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gecko-media 0.1.0 (git+https://github.com/servo/gecko-media.git)",
  "gleam 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "half 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "html5ever 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2680,6 +2772,19 @@ name = "semver"
 version = "0.1.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "semver"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "semver-parser"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "serde"
 version = "1.0.14"
@@ -3207,6 +3312,39 @@ dependencies = [
  "syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "syntex_errors"
+version = "0.58.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syntex_pos 0.58.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "term 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "syntex_pos"
+version = "0.58.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "syntex_syntax"
+version = "0.58.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syntex_errors 0.58.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syntex_pos 0.58.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "task_info"
 version = "0.0.1"
@@ -3224,6 +3362,15 @@ dependencies = [
  "utf-8 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "term"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "term_size"
 version = "0.2.3"
@@ -3287,6 +3434,14 @@ name = "toml"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "toml"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "serde 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "traitobject"
 version = "0.1.0"
@@ -3310,6 +3465,14 @@ dependencies = [
  "rustc_version 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "unicase"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rustc_version 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "unicode-bidi"
 version = "0.3.3"
@@ -3703,6 +3866,8 @@ dependencies = [
 "checksum core-text 7.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2a23bef779fab70e5e6af23e36eed03a48e1c1687dea8929505d405ea48d1f5e"
 "checksum cssparser 0.22.0 (registry+https://github.com/rust-lang/crates.io-index)" = "44313341610282488e1156ad1fedebca51c54766c87a041d0287b10499c04ba1"
 "checksum cssparser-macros 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "079adec4af52bb5275eadd004292028c79eb3c5f5b4ee8086a36d4197032f6df"
+"checksum cubeb-ffi 0.0.1 (git+https://github.com/djg/cubeb-pulse-rs?branch=dev)" = "<none>"
+"checksum cubeb-pulse 0.0.1 (git+https://github.com/djg/cubeb-pulse-rs?branch=dev)" = "<none>"
 "checksum darling 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "9861a8495606435477df581bc858ccf15a3469747edf175b94a4704fd9aaedac"
 "checksum darling_core 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1486a8b00b45062c997f767738178b43219133dd0c8c826cb811e60563810821"
 "checksum darling_macro 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8a86ec160aa0c3dd492dd4a14ec8104ad8f1a9400a820624db857998cc1f80f9"
@@ -3716,6 +3881,7 @@ dependencies = [
 "checksum dwmapi-sys 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "07c4c7cc7b396419bc0a4d90371d0cee16cb5053b53647d287c0b728000c41fe"
 "checksum dwrote 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "36e3b27cd0b8a68e00f07e8d8e1e4f4d8a6b8b873290a734f63bd56d792d23e1"
 "checksum either 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "18785c1ba806c258137c937e44ada9ee7e69a37e3c72077542cd2f069d78562a"
+"checksum encoding_c 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "93ec52324ca72f423237a413ca0e1c60654c8b3d0934fcd5fd888508dfcc4ba7"
 "checksum encoding_rs 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)" = "f5215aabf22b83153be3ee44dfe3f940214541b2ce13d419c55e7a115c8c51a9"
 "checksum energy-monitor 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fe872d0664f1cc60db36349af245d892ee67d3c8f78055df0ebc43271fd4e05c"
 "checksum energymon 0.3.0 (git+https://github.com/energymon/energymon-rust.git)" = "<none>"
@@ -3739,6 +3905,7 @@ dependencies = [
 "checksum gaol 0.0.1 (git+https://github.com/servo/gaol)" = "<none>"
 "checksum gcc 0.3.47 (registry+https://github.com/rust-lang/crates.io-index)" = "5773372df827453bc38d4fd8efe425c7f28b1f54468816183fc8716cfb90bd30"
 "checksum gdi32-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "0912515a8ff24ba900422ecda800b52f4016a56251922d397c576bf92c690518"
+"checksum gecko-media 0.1.0 (git+https://github.com/servo/gecko-media.git)" = "<none>"
 "checksum getopts 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)" = "d9047cfbd08a437050b363d35ef160452c5fe8ea5187ae0a624708c91581d685"
 "checksum gif 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)" = "8a80d6fe9e52f637df9afd4779449a7be17c39cc9c35b01589bb833f956ba596"
 "checksum gl_generator 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "0940975a4ca12b088d32b5d5134826c47d2e73de4b0b459b05244c01503eccbb"
@@ -3790,15 +3957,18 @@ dependencies = [
 "checksum memchr 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1dbccc0e46f1ea47b9f17e6d67c5a96bd27030519c519c9c91327e31275a47b4"
 "checksum metadeps 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "73b122901b3a675fac8cecf68dcb2f0d3036193bc861d1ac0e1c337f7d5254c2"
 "checksum mime 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "9d69889cdc6336ed56b174514ce876c4c3dc564cc23dd872e7bca589bb2a36c8"
+"checksum mime 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "e2e00e17be181010a91dbfefb01660b17311059dc8c7f48b9017677721e732bd"
 "checksum mime_guess 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "76da6df85047af8c0edfa53f48eb1073012ce1cc95c8fedc0a374f659a89dd65"
 "checksum miniz-sys 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)" = "28eaee17666671fa872e567547e8428e83308ebe5808cdf6a0e28397dbe2c726"
 "checksum mio 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)" = "9e965267d4d58496fc4f740e9861118367f13570cadf66316ed2c3f2f14d87c7"
 "checksum miow 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "8c1f2f3b1cf331de6896aabf6e9d55dca90356cc9960cca7eaaf408a355ae919"
 "checksum mitochondria 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9de3eca27871df31c33b807f834b94ef7d000956f57aa25c5aed9c5f0aae8f6f"
+"checksum moz-cheddar 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "43b29fdad80b06f38d959105a138ab8ca8c5a57c3435f5bfbd770fa73e625015"
 "checksum mozjs 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "722aeeec7049d03494ef79190343c2dea89c743c2d66acfb4555aef69dd77061"
 "checksum mozjs_sys 0.50.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ef1e24df9f76502cd4459919098ec1ac3af75ce694ec5b8837aa91f69f2ad0eb"
 "checksum mp3-metadata 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "4ab5f1d2693586420208d1200ce5a51cd44726f055b635176188137aff42c7de"
 "checksum mp4parse 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "99942c1e9fa8b6fc9b63c6eb65bc6d442df3bcd8b8889de5b436f5527fd81adf"
+"checksum mp4parse_capi 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "0ac2e80957ee77a45c69837b82ecb95ed08d006bfaeb6ddb3660984be648e8f2"
 "checksum multistr 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "90fb6e1b4f6ca2f2098a437e1c7f09c122da62bbf2bde45b3693defc1eb61e2d"
 "checksum net2 0.2.29 (registry+https://github.com/rust-lang/crates.io-index)" = "bc01404e7568680f1259aa5729539f221cb1e6d047a0d9053cab4be8a73b5d67"
 "checksum nodrop 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "0dbbadd3f4c98dea0bd3d9b4be4c0cdaf1ab57035cb2e41fce3983db5add7cc5"
@@ -3837,6 +4007,8 @@ dependencies = [
 "checksum png 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5b5c59debbb04e708775b004dce99d66984d5448625d63408ad502014d2880cd"
 "checksum precomputed-hash 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "925383efa346730478fb4838dbe9137d2a47675ad789c546d150a6e1dd4ab31c"
 "checksum procedural-masquerade 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c93cdc1fb30af9ddf3debc4afbdb0f35126cbd99daa229dd76cdd5349b41d989"
+"checksum pulse 0.1.0 (git+https://github.com/djg/cubeb-pulse-rs?branch=dev)" = "<none>"
+"checksum pulse-ffi 0.1.0 (git+https://github.com/djg/cubeb-pulse-rs?branch=dev)" = "<none>"
 "checksum push-trait 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fdc13b1a53bc505b526086361221aaa612fefb9b0ecf2853f9d31f807764e004"
 "checksum quote 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e920b65c65f10b2ae65c831a81a073a89edd28c7cce89475bff467ab4167a"
 "checksum rand 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)" = "022e0636ec2519ddae48154b028864bdce4eaf7d35226ab8e65c611be97b189d"
@@ -3857,6 +4029,8 @@ dependencies = [
 "checksum scoped_threadpool 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "3ef399c8893e8cb7aa9696e895427fab3a6bf265977bb96e126f24ddd2cda85a"
 "checksum scopeguard 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c79eb2c3ac4bc2507cda80e7f3ac5b88bd8eae4c0914d5663e6a8933994be918"
 "checksum semver 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)" = "d4f410fedcf71af0345d7607d246e7ad15faaadd49d240ee3b24e5dc21a820ac"
+"checksum semver 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a3186ec9e65071a2095434b1f5bb24838d4e8e130f584c790f6033c79943537"
+"checksum semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
 "checksum serde 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)" = "bcb6a7637a47663ee073391a139ed07851f27ed2532c2abc88c6bf27a16cdf34"
 "checksum serde_bytes 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a73f5ad9bb83e1e407254c7a355f4efdaffe3c1442fc0657ddb8b9b6b225655"
 "checksum serde_derive 1.0.14 (registry+https://github.com/rust-lang/crates.io-index)" = "812ff66056fd9a9a5b7c119714243b0862cf98340e7d4b5ee05a932c40d5ea6c"
@@ -3888,7 +4062,11 @@ dependencies = [
 "checksum syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)" = "d3b891b9015c88c576343b9b3e41c2c11a51c219ef067b264bd9c8aa9b441dad"
 "checksum synom 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a393066ed9010ebaed60b9eafa373d4b1baac186dd7e008555b0f702b51945b6"
 "checksum synstructure 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "cf318c34a2f8381a4f3d4db2c91b45bca2b1cd8cbe56caced900647be164800c"
+"checksum syntex_errors 0.58.1 (registry+https://github.com/rust-lang/crates.io-index)" = "867cc5c2d7140ae7eaad2ae9e8bf39cb18a67ca651b7834f88d46ca98faadb9c"
+"checksum syntex_pos 0.58.1 (registry+https://github.com/rust-lang/crates.io-index)" = "13ad4762fe52abc9f4008e85c4fb1b1fe3aa91ccb99ff4826a439c7c598e1047"
+"checksum syntex_syntax 0.58.1 (registry+https://github.com/rust-lang/crates.io-index)" = "6e0e4dbae163dd98989464c23dd503161b338790640e11537686f2ef0f25c791"
 "checksum tendril 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "9de21546595a0873061940d994bbbc5c35f024ae4fd61ec5c5b159115684f508"
+"checksum term 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "fa63644f74ce96fbeb9b794f66aff2a52d601cbd5e80f4b97123e3899f4570f1"
 "checksum term_size 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "07b6c1ac5b3fffd75073276bca1ceed01f67a28537097a2a9539e116e50fb21a"
 "checksum thread-id 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8df7875b676fddfadffd96deea3b1124e5ede707d4884248931077518cf1f773"
 "checksum thread_local 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "c85048c6260d17cf486ceae3282d9fb6b90be220bf5b28c400f5485ffc29f0c7"
@@ -3897,10 +4075,12 @@ dependencies = [
 "checksum time 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)" = "ffd7ccbf969a892bf83f1e441126968a07a3941c24ff522a26af9f9f4585d1a3"
 "checksum tinyfiledialogs 2.5.9 (registry+https://github.com/rust-lang/crates.io-index)" = "1d401358cd71aca93d5f4fccd3db5b87d970ae70fe457911929d99f4a87f7531"
 "checksum toml 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "736b60249cb25337bc196faa43ee12c705e426f3d55c214d73a4e7be06f92cb4"
+"checksum toml 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)" = "a7540f4ffc193e0d3c94121edb19b055670d369f77d5804db11ae053a45b6e7e"
 "checksum traitobject 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "efd1f82c56340fdf16f2a953d7bda4f8fdffba13d93b00844c25572110b26079"
 "checksum truetype 0.26.0 (registry+https://github.com/rust-lang/crates.io-index)" = "acec30350633d6dac9dc1a625786b6cbe9150664be941aac2c35ad7199eab877"
 "checksum typeable 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1410f6f91f21d1612654e7cc69193b0334f909dcf2c790c4826254fbb86f8887"
 "checksum unicase 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "13a5906ca2b98c799f4b1ab4557b76367ebd6ae5ef14930ec841c74aed5f3764"
+"checksum unicase 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2e01da42520092d0cd2d6ac3ae69eb21a22ad43ff195676b86f8c37f487d6b80"
 "checksum unicode-bidi 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a6a2c4e3710edd365cd7e78383153ed739fa31af19f9172f72d3575060f5a43a"
 "checksum unicode-normalization 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "51ccda9ef9efa3f7ef5d91e8f9b83bbe6955f9bf86aec89d5cce2c874625920f"
 "checksum unicode-script 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "e5430ae21ef212551680d0021fc7dbd936e8b268c5ea8fdae8814e0b2496d80f"
diff --git a/components/script/Cargo.toml b/components/script/Cargo.toml
index 76f8b187537..37c4dd10bc5 100644
--- a/components/script/Cargo.toml
+++ b/components/script/Cargo.toml
@@ -23,6 +23,9 @@ phf_codegen = "0.7.18"
 phf_shared = "0.7.18"
 serde_json = "1.0"
 
+[target.'cfg(all(any(target_os = "macos", target_os = "linux"), not(any(target_arch = "arm", target_arch = "aarch64"))))'.dependencies]
+gecko-media = {git = "https://github.com/servo/gecko-media.git"}
+
 [target.'cfg(any(target_os = "macos", target_os = "linux", target_os = "windows"))'.dependencies]
 tinyfiledialogs = "2.5.9"
 
diff --git a/components/script/lib.rs b/components/script/lib.rs
index 46d06b066b6..3bae98a1a06 100644
--- a/components/script/lib.rs
+++ b/components/script/lib.rs
@@ -41,6 +41,9 @@ extern crate domobject_derive;
 extern crate encoding_rs;
 extern crate euclid;
 extern crate fnv;
+#[allow(unused_extern_crates)]
+#[cfg(all(any(target_os = "macos", target_os = "linux"), not(any(target_arch = "arm", target_arch = "aarch64"))))]
+extern crate gecko_media;
 extern crate gleam;
 extern crate half;
 #[macro_use] extern crate html5ever;
diff --git a/etc/ci/buildbot_steps.yml b/etc/ci/buildbot_steps.yml
index 8b340df20c0..6ac4f2f3731 100644
--- a/etc/ci/buildbot_steps.yml
+++ b/etc/ci/buildbot_steps.yml
@@ -61,12 +61,12 @@ mac-nightly:
 
 linux-rel-intermittent:
   - ./mach clean-nightlies --keep 3 --force
-  - ./mach build --release
+  - env CC=gcc-5 CXX=g++-5 ./mach build --release
   - ./etc/ci/check_intermittents.sh --log-raw intermittents.log
 
 linux-rel-nogate:
   - ./mach clean-nightlies --keep 3 --force
-  - ./mach build --release
+  - env CC=gcc-5 CXX=g++-5 ./mach build --release
   - python ./etc/ci/chaos_monkey_test.py
 
 mac-rel-intermittent:
@@ -78,7 +78,7 @@ linux-dev:
   - ./mach clean-nightlies --keep 3 --force
   - ./mach test-tidy --no-progress --all
   - ./mach test-tidy --no-progress --self-test
-  - env ./mach build --dev
+  - env CC=gcc-5 CXX=g++-5 ./mach build --dev
   - env ./mach test-compiletest
   - env ./mach test-unit
   - env ./mach package --dev
@@ -92,7 +92,7 @@ linux-dev:
 
 linux-rel-wpt:
   - ./mach clean-nightlies --keep 3 --force
-  - ./mach build --release --with-debug-assertions
+  - env CC=gcc-5 CXX=g++-5 ./mach build --release --with-debug-assertions
   - ./mach test-wpt-failure
   - ./mach test-wpt --release --processes 24 --total-chunks 2 --this-chunk 1 --log-raw test-wpt.log --log-errorsummary wpt-errorsummary.log --always-succeed
   - ./mach filter-intermittents wpt-errorsummary.log --log-intermittents intermittents.log --log-filteredsummary filtered-wpt-errorsummary.log --tracker-api default --reporter-api default
@@ -100,7 +100,7 @@ linux-rel-wpt:
 
 linux-rel-css:
   - ./mach clean-nightlies --keep 3 --force
-  - ./mach build --release --with-debug-assertions
+  - env CC=gcc-5 CXX=g++-5 ./mach build --release --with-debug-assertions
   - ./mach test-wpt --release --processes 24 --total-chunks 2 --this-chunk 2 --log-raw test-wpt.log --log-errorsummary wpt-errorsummary.log --always-succeed
   - ./mach filter-intermittents wpt-errorsummary.log --log-intermittents intermittents.log --log-filteredsummary filtered-wpt-errorsummary.log --tracker-api default --reporter-api default
   - ./mach build-geckolib --release
@@ -110,7 +110,7 @@ linux-rel-css:
 
 linux-nightly:
   - ./mach clean-nightlies --keep 3 --force
-  - ./mach build --release
+  - env CC=gcc-5 CXX=g++-5 ./mach build --release
   - ./mach package --release
   - ./mach upload-nightly linux
 
diff --git a/servo-tidy.toml b/servo-tidy.toml
index 756b09dd72c..b2feec6577d 100644
--- a/servo-tidy.toml
+++ b/servo-tidy.toml
@@ -35,6 +35,10 @@ num = []
 # Ignored packages with duplicated versions
 packages = [
   "bitflags",
+  "mime",
+  "semver",
+  "toml",
+  "unicase",
 ]
 # Files that are ignored for all tidy and lint checks.
 files = [