diff --git a/components/style/Cargo.toml b/components/style/Cargo.toml
index 5198dc05b14..566506e987e 100644
--- a/components/style/Cargo.toml
+++ b/components/style/Cargo.toml
@@ -11,7 +11,7 @@ name = "style"
 path = "lib.rs"
 
 [features]
-gecko = []
+gecko = ["gecko_bindings"]
 
 [dependencies]
 app_units = {version = "0.2.3", features = ["plugins"]}
@@ -20,6 +20,7 @@ cssparser = {version = "0.5.5", features = ["heap_size", "serde-serialization"]}
 encoding = "0.2"
 euclid = {version = "0.6.4", features = ["plugins"]}
 fnv = "1.0"
+gecko_bindings = {path = "../../ports/geckolib/gecko_bindings", optional = true}
 heapsize = "0.3.0"
 heapsize_plugin = "0.1.2"
 lazy_static = "0.2"
diff --git a/components/style/lib.rs b/components/style/lib.rs
index 00d5d079066..4ec45e45e04 100644
--- a/components/style/lib.rs
+++ b/components/style/lib.rs
@@ -28,6 +28,8 @@ extern crate cssparser;
 extern crate encoding;
 extern crate euclid;
 extern crate fnv;
+#[cfg(feature = "gecko")]
+extern crate gecko_bindings;
 extern crate heapsize;
 #[allow(unused_extern_crates)]
 #[macro_use]
diff --git a/components/style/parser.rs b/components/style/parser.rs
index 5a38c2f22b5..eadb778db55 100644
--- a/components/style/parser.rs
+++ b/components/style/parser.rs
@@ -5,6 +5,8 @@
 
 use cssparser::{Parser, SourcePosition};
 use error_reporting::ParseErrorReporter;
+#[cfg(feature = "gecko")]
+use gecko_bindings::ptr::{GeckoArcPrincipal, GeckoArcURI};
 use selectors::parser::ParserContext as SelectorParserContext;
 use stylesheets::Origin;
 use url::Url;
@@ -14,6 +16,9 @@ pub struct ParserContextExtraData;
 
 #[cfg(feature = "gecko")]
 pub struct ParserContextExtraData {
+    pub base: Option<GeckoArcURI>,
+    pub referrer: Option<GeckoArcURI>,
+    pub principal: Option<GeckoArcPrincipal>,
 }
 
 impl ParserContextExtraData {
@@ -24,7 +29,7 @@ impl ParserContextExtraData {
 
     #[cfg(feature = "gecko")]
     pub fn default() -> ParserContextExtraData {
-        ParserContextExtraData { }
+        ParserContextExtraData { base: None, referrer: None, principal: None }
     }
 }
 
diff --git a/ports/geckolib/Cargo.lock b/ports/geckolib/Cargo.lock
index 3e88bea0062..54b62cd7830 100644
--- a/ports/geckolib/Cargo.lock
+++ b/ports/geckolib/Cargo.lock
@@ -453,6 +453,7 @@ dependencies = [
  "encoding 0.2.32 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gecko_bindings 0.0.1",
  "heapsize 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize_plugin 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/ports/geckolib/glue.rs b/ports/geckolib/glue.rs
index d4c268f58fb..578fb5a1a77 100644
--- a/ports/geckolib/glue.rs
+++ b/ports/geckolib/glue.rs
@@ -10,7 +10,8 @@ use env_logger;
 use euclid::Size2D;
 use gecko_bindings::bindings::{RawGeckoDocument, RawGeckoElement, RawGeckoNode};
 use gecko_bindings::bindings::{RawServoStyleSet, RawServoStyleSheet, ServoComputedValues, ServoNodeData};
-use gecko_bindings::bindings::{nsIAtom};
+use gecko_bindings::bindings::{ThreadSafePrincipalHolder, ThreadSafeURIHolder, nsIAtom};
+use gecko_bindings::ptr::{GeckoArcPrincipal, GeckoArcURI};
 use gecko_bindings::structs::SheetParsingMode;
 use properties::GeckoComputedValues;
 use selector_impl::{GeckoSelectorImpl, PseudoElement, SharedStyleContext, Stylesheet};
@@ -121,7 +122,11 @@ pub extern "C" fn Servo_DropNodeData(data: *mut ServoNodeData) -> () {
 #[no_mangle]
 pub extern "C" fn Servo_StylesheetFromUTF8Bytes(bytes: *const u8,
                                                 length: u32,
-                                                mode: SheetParsingMode) -> *mut RawServoStyleSheet {
+                                                mode: SheetParsingMode,
+                                                base: *mut ThreadSafeURIHolder,
+                                                referrer: *mut ThreadSafeURIHolder,
+                                                principal: *mut ThreadSafePrincipalHolder)
+                                                -> *mut RawServoStyleSheet {
 
     let input = unsafe { from_utf8_unchecked(slice::from_raw_parts(bytes, length as usize)) };
 
@@ -133,7 +138,11 @@ pub extern "C" fn Servo_StylesheetFromUTF8Bytes(bytes: *const u8,
 
     // FIXME(heycam): Pass in the real base URL.
     let url = Url::parse("about:none").unwrap();
-    let extra_data = ParserContextExtraData { };
+    let extra_data = ParserContextExtraData {
+        base: Some(GeckoArcURI::new(base)),
+        referrer: Some(GeckoArcURI::new(referrer)),
+        principal: Some(GeckoArcPrincipal::new(principal)),
+    };
     let sheet = Arc::new(Stylesheet::from_str(input, url, origin, Box::new(StdoutErrorReporter),
                                               extra_data));
     unsafe {