diff --git a/components/style/binding_tools/regen_atoms.py b/components/style/binding_tools/regen_atoms.py
index 2d8aed166ba..eb6e9752d51 100755
--- a/components/style/binding_tools/regen_atoms.py
+++ b/components/style/binding_tools/regen_atoms.py
@@ -16,7 +16,7 @@ PRELUDE = """
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-/* Autogenerated file, DO NOT EDIT DIRECTLY */
+/* Autogenerated file created by components/style/binding_tools/regen_atoms.py, DO NOT EDIT DIRECTLY */
 """[1:]
 
 
diff --git a/components/style/gecko/generated/gecko_pseudo_element_helper.rs b/components/style/gecko/generated/gecko_pseudo_element_helper.rs
index b47874d2420..37b27f42e19 100644
--- a/components/style/gecko/generated/gecko_pseudo_element_helper.rs
+++ b/components/style/gecko/generated/gecko_pseudo_element_helper.rs
@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-/* Autogenerated file, DO NOT EDIT DIRECTLY */
+/* Autogenerated file created by components/style/binding_tools/regen_atoms.py, DO NOT EDIT DIRECTLY */
 
 /*
  * This file contains a helper macro invocation to aid Gecko's style system
@@ -109,11 +109,8 @@
     pseudo_element!(":-moz-first-letter-continuation",
                     atom!(":-moz-first-letter-continuation"),
                     true);
-    pseudo_element!(":-moz-anonymous-block",
-                    atom!(":-moz-anonymous-block"),
-                    true);
-    pseudo_element!(":-moz-anonymous-positioned-block",
-                    atom!(":-moz-anonymous-positioned-block"),
+    pseudo_element!(":-moz-block-inside-inline-wrapper",
+                    atom!(":-moz-block-inside-inline-wrapper"),
                     true);
     pseudo_element!(":-moz-mathml-anonymous-block",
                     atom!(":-moz-mathml-anonymous-block"),
diff --git a/components/style/gecko_string_cache/atom_macro.rs b/components/style/gecko_string_cache/atom_macro.rs
index f285404a87c..33e9dc034f0 100644
--- a/components/style/gecko_string_cache/atom_macro.rs
+++ b/components/style/gecko_string_cache/atom_macro.rs
@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-/* Autogenerated file, DO NOT EDIT DIRECTLY */
+/* Autogenerated file created by components/style/binding_tools/regen_atoms.py, DO NOT EDIT DIRECTLY */
 
 use gecko_bindings::structs::nsIAtom;
 use string_cache::Atom;
@@ -1768,8 +1768,12 @@ cfg_if! {
             pub static nsGkAtoms_onremoteheld: *mut nsIAtom;
             #[link_name = "_ZN9nsGkAtoms15onremoteresumedE"]
             pub static nsGkAtoms_onremoteresumed: *mut nsIAtom;
+            #[link_name = "_ZN9nsGkAtoms17onrequestprogressE"]
+            pub static nsGkAtoms_onrequestprogress: *mut nsIAtom;
             #[link_name = "_ZN9nsGkAtoms26onresourcetimingbufferfullE"]
             pub static nsGkAtoms_onresourcetimingbufferfull: *mut nsIAtom;
+            #[link_name = "_ZN9nsGkAtoms18onresponseprogressE"]
+            pub static nsGkAtoms_onresponseprogress: *mut nsIAtom;
             #[link_name = "_ZN9nsGkAtoms12onretrievingE"]
             pub static nsGkAtoms_onretrieving: *mut nsIAtom;
             #[link_name = "_ZN9nsGkAtoms9onRequestE"]
@@ -4834,10 +4838,8 @@ cfg_if! {
             pub static nsCSSAnonBoxes_oofPlaceholder: *mut nsICSSAnonBoxPseudo;
             #[link_name = "_ZN14nsCSSAnonBoxes23firstLetterContinuationE"]
             pub static nsCSSAnonBoxes_firstLetterContinuation: *mut nsICSSAnonBoxPseudo;
-            #[link_name = "_ZN14nsCSSAnonBoxes17mozAnonymousBlockE"]
-            pub static nsCSSAnonBoxes_mozAnonymousBlock: *mut nsICSSAnonBoxPseudo;
-            #[link_name = "_ZN14nsCSSAnonBoxes27mozAnonymousPositionedBlockE"]
-            pub static nsCSSAnonBoxes_mozAnonymousPositionedBlock: *mut nsICSSAnonBoxPseudo;
+            #[link_name = "_ZN14nsCSSAnonBoxes27mozBlockInsideInlineWrapperE"]
+            pub static nsCSSAnonBoxes_mozBlockInsideInlineWrapper: *mut nsICSSAnonBoxPseudo;
             #[link_name = "_ZN14nsCSSAnonBoxes23mozMathMLAnonymousBlockE"]
             pub static nsCSSAnonBoxes_mozMathMLAnonymousBlock: *mut nsICSSAnonBoxPseudo;
             #[link_name = "_ZN14nsCSSAnonBoxes20mozXULAnonymousBlockE"]
@@ -6697,8 +6699,12 @@ cfg_if! {
             pub static nsGkAtoms_onremoteheld: *mut nsIAtom;
             #[link_name = "?onremoteresumed@nsGkAtoms@@2PEAVnsIAtom@@EA"]
             pub static nsGkAtoms_onremoteresumed: *mut nsIAtom;
+            #[link_name = "?onrequestprogress@nsGkAtoms@@2PEAVnsIAtom@@EA"]
+            pub static nsGkAtoms_onrequestprogress: *mut nsIAtom;
             #[link_name = "?onresourcetimingbufferfull@nsGkAtoms@@2PEAVnsIAtom@@EA"]
             pub static nsGkAtoms_onresourcetimingbufferfull: *mut nsIAtom;
+            #[link_name = "?onresponseprogress@nsGkAtoms@@2PEAVnsIAtom@@EA"]
+            pub static nsGkAtoms_onresponseprogress: *mut nsIAtom;
             #[link_name = "?onretrieving@nsGkAtoms@@2PEAVnsIAtom@@EA"]
             pub static nsGkAtoms_onretrieving: *mut nsIAtom;
             #[link_name = "?onRequest@nsGkAtoms@@2PEAVnsIAtom@@EA"]
@@ -9763,10 +9769,8 @@ cfg_if! {
             pub static nsCSSAnonBoxes_oofPlaceholder: *mut nsICSSAnonBoxPseudo;
             #[link_name = "?firstLetterContinuation@nsCSSAnonBoxes@@2PEAVnsICSSAnonBoxPseudo@@EA"]
             pub static nsCSSAnonBoxes_firstLetterContinuation: *mut nsICSSAnonBoxPseudo;
-            #[link_name = "?mozAnonymousBlock@nsCSSAnonBoxes@@2PEAVnsICSSAnonBoxPseudo@@EA"]
-            pub static nsCSSAnonBoxes_mozAnonymousBlock: *mut nsICSSAnonBoxPseudo;
-            #[link_name = "?mozAnonymousPositionedBlock@nsCSSAnonBoxes@@2PEAVnsICSSAnonBoxPseudo@@EA"]
-            pub static nsCSSAnonBoxes_mozAnonymousPositionedBlock: *mut nsICSSAnonBoxPseudo;
+            #[link_name = "?mozBlockInsideInlineWrapper@nsCSSAnonBoxes@@2PEAVnsICSSAnonBoxPseudo@@EA"]
+            pub static nsCSSAnonBoxes_mozBlockInsideInlineWrapper: *mut nsICSSAnonBoxPseudo;
             #[link_name = "?mozMathMLAnonymousBlock@nsCSSAnonBoxes@@2PEAVnsICSSAnonBoxPseudo@@EA"]
             pub static nsCSSAnonBoxes_mozMathMLAnonymousBlock: *mut nsICSSAnonBoxPseudo;
             #[link_name = "?mozXULAnonymousBlock@nsCSSAnonBoxes@@2PEAVnsICSSAnonBoxPseudo@@EA"]
@@ -11626,8 +11630,12 @@ cfg_if! {
             pub static nsGkAtoms_onremoteheld: *mut nsIAtom;
             #[link_name = "\x01?onremoteresumed@nsGkAtoms@@2PAVnsIAtom@@A"]
             pub static nsGkAtoms_onremoteresumed: *mut nsIAtom;
+            #[link_name = "\x01?onrequestprogress@nsGkAtoms@@2PAVnsIAtom@@A"]
+            pub static nsGkAtoms_onrequestprogress: *mut nsIAtom;
             #[link_name = "\x01?onresourcetimingbufferfull@nsGkAtoms@@2PAVnsIAtom@@A"]
             pub static nsGkAtoms_onresourcetimingbufferfull: *mut nsIAtom;
+            #[link_name = "\x01?onresponseprogress@nsGkAtoms@@2PAVnsIAtom@@A"]
+            pub static nsGkAtoms_onresponseprogress: *mut nsIAtom;
             #[link_name = "\x01?onretrieving@nsGkAtoms@@2PAVnsIAtom@@A"]
             pub static nsGkAtoms_onretrieving: *mut nsIAtom;
             #[link_name = "\x01?onRequest@nsGkAtoms@@2PAVnsIAtom@@A"]
@@ -14692,10 +14700,8 @@ cfg_if! {
             pub static nsCSSAnonBoxes_oofPlaceholder: *mut nsICSSAnonBoxPseudo;
             #[link_name = "\x01?firstLetterContinuation@nsCSSAnonBoxes@@2PAVnsICSSAnonBoxPseudo@@A"]
             pub static nsCSSAnonBoxes_firstLetterContinuation: *mut nsICSSAnonBoxPseudo;
-            #[link_name = "\x01?mozAnonymousBlock@nsCSSAnonBoxes@@2PAVnsICSSAnonBoxPseudo@@A"]
-            pub static nsCSSAnonBoxes_mozAnonymousBlock: *mut nsICSSAnonBoxPseudo;
-            #[link_name = "\x01?mozAnonymousPositionedBlock@nsCSSAnonBoxes@@2PAVnsICSSAnonBoxPseudo@@A"]
-            pub static nsCSSAnonBoxes_mozAnonymousPositionedBlock: *mut nsICSSAnonBoxPseudo;
+            #[link_name = "\x01?mozBlockInsideInlineWrapper@nsCSSAnonBoxes@@2PAVnsICSSAnonBoxPseudo@@A"]
+            pub static nsCSSAnonBoxes_mozBlockInsideInlineWrapper: *mut nsICSSAnonBoxPseudo;
             #[link_name = "\x01?mozMathMLAnonymousBlock@nsCSSAnonBoxes@@2PAVnsICSSAnonBoxPseudo@@A"]
             pub static nsCSSAnonBoxes_mozMathMLAnonymousBlock: *mut nsICSSAnonBoxPseudo;
             #[link_name = "\x01?mozXULAnonymousBlock@nsCSSAnonBoxes@@2PAVnsICSSAnonBoxPseudo@@A"]
@@ -16558,8 +16564,12 @@ macro_rules! atom {
   { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms_onremoteheld as *mut _) } };
 ("onremoteresumed") =>
   { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms_onremoteresumed as *mut _) } };
+("onrequestprogress") =>
+  { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms_onrequestprogress as *mut _) } };
 ("onresourcetimingbufferfull") =>
   { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms_onresourcetimingbufferfull as *mut _) } };
+("onresponseprogress") =>
+  { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms_onresponseprogress as *mut _) } };
 ("onretrieving") =>
   { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms_onretrieving as *mut _) } };
 ("onRequest") =>
@@ -19624,10 +19634,8 @@ macro_rules! atom {
   { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsCSSAnonBoxes_oofPlaceholder as *mut _) } };
 (":-moz-first-letter-continuation") =>
   { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsCSSAnonBoxes_firstLetterContinuation as *mut _) } };
-(":-moz-anonymous-block") =>
-  { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsCSSAnonBoxes_mozAnonymousBlock as *mut _) } };
-(":-moz-anonymous-positioned-block") =>
-  { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsCSSAnonBoxes_mozAnonymousPositionedBlock as *mut _) } };
+(":-moz-block-inside-inline-wrapper") =>
+  { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsCSSAnonBoxes_mozBlockInsideInlineWrapper as *mut _) } };
 (":-moz-mathml-anonymous-block") =>
   { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsCSSAnonBoxes_mozMathMLAnonymousBlock as *mut _) } };
 (":-moz-xul-anonymous-block") =>