diff --git a/firefox/.signature b/firefox/.signature
index 758b8c62b..9dcd370cf 100644
--- a/firefox/.signature
+++ b/firefox/.signature
@@ -1,9 +1,10 @@
 untrusted comment: verify with /etc/ports/contrib.pub
-RWSagIOpLGJF360PAg4hg7MXte73FAeiaVyv7Kudw+FDIM4jvv+7OZpB4s0Vbjf0Bd0Uiiyn0KcFApXf/cMYwkLlCnOgivtNXwA=
-SHA256 (Pkgfile) = 0a6681b9978885b7bf5557ee369c18863402fd1b9344a00b3a2ddffba0104ff4
+RWSagIOpLGJF331+qtaQOTcus22sLuYCWmWlK7xPS7TqrRzbpAyX4uC6YVtkSWHdpwkImWvMGmarglCbgX73y9F4zDqfMH2wUg8=
+SHA256 (Pkgfile) = e07c75277b244edf199d36b600ff93f460ac6e07c9f23162393d1f52130dbea6
 SHA256 (.footprint) = 2bf9d0db0db4636671ffc262a68acd4536e6cedcae47ecb26d5dbf87483a66ef
-SHA256 (firefox-129.0.1.source.tar.xz) = 9ddfe823e4c22167a77e47f56a8afde0d9621784a9e4e5dba4906e758175c073
+SHA256 (firefox-129.0.2.source.tar.xz) = 35a1da121af474833d013ecbc1f77aa55bb35678fe06d438842d320dfab3f344
 SHA256 (firefox.desktop) = a092fddc62bf5bff0c0f7891f59278463fa9b6ec24e9d811e49cd10b2282bdee
 SHA256 (icu-linebreak-classes.patch) = bdfd2a93be5eed5c723ae67b308c4c2d9ed91d3173839fe560a7ca47946c7813
 SHA256 (fix-target-detection.patch) = 33199c6d64a2a775b4ede35aae84b95cef8476e8995a1d1b99eb65efb59008f4
+SHA256 (fix-for-cbindgen-0.27.patch) = fdd8666af08a8467f8f79e11bd1376fa7b93696b77a22f20c00fe8fac1ad8da2
 SHA256 (node-stdout-nonblocking-wrapper) = bb8c503015e49ed1b152225bdc56cf502cd831f35962d113dcbb9121967f3523
diff --git a/firefox/Pkgfile b/firefox/Pkgfile
index e10374d3e..2dcbd826f 100644
--- a/firefox/Pkgfile
+++ b/firefox/Pkgfile
@@ -5,12 +5,13 @@
 # Optional: apulse jack pulseaudio pipewire sndio sccache lld wayland
 
 name=firefox
-version=129.0.1
+version=129.0.2
 release=1
 source=(https://ftp.mozilla.org/pub/$name/releases/$version/source/$name-$version.source.tar.xz
   firefox.desktop
   icu-linebreak-classes.patch
   fix-target-detection.patch
+  fix-for-cbindgen-0.27.patch
   node-stdout-nonblocking-wrapper)
 
 build() {
diff --git a/firefox/fix-for-cbindgen-0.27.patch b/firefox/fix-for-cbindgen-0.27.patch
new file mode 100644
index 000000000..f04f272ac
--- /dev/null
+++ b/firefox/fix-for-cbindgen-0.27.patch
@@ -0,0 +1,94 @@
+
+# HG changeset patch
+# User Emilio Cobos Álvarez <emilio@crisal.io>
+# Date 1723389149 0
+# Node ID 98cd34c7ff5740b62e6c0c432799cd37fe017005
+# Parent  0d743db7da62389442a78d216091b0917ff33589
+Bug 1912663 - Fix some build issues with cbindgen 0.27. r=firefox-style-system-reviewers,zrhoffman
+
+It updates serde and syn and they are more strict. In particular, syn 2
+doesn't parse the rust 2015 syntax where try is not a keyword, and serde
+rejects duplicate keys.
+
+Differential Revision: https://phabricator.services.mozilla.com/D219025
+
+diff --git a/servo/components/style_traits/values.rs b/servo/components/style_traits/values.rs
+--- a/servo/components/style_traits/values.rs
++++ b/servo/components/style_traits/values.rs
+@@ -384,21 +384,21 @@ impl Separator for Space {
+ 
+     fn parse<'i, 't, F, T, E>(
+         input: &mut Parser<'i, 't>,
+         mut parse_one: F,
+     ) -> Result<Vec<T>, ParseError<'i, E>>
+     where
+         F: for<'tt> FnMut(&mut Parser<'i, 'tt>) -> Result<T, ParseError<'i, E>>,
+     {
+-        input.skip_whitespace(); // Unnecessary for correctness, but may help try() rewind less.
++        input.skip_whitespace(); // Unnecessary for correctness, but may help try_parse() rewind less.
+         let mut results = vec![parse_one(input)?];
+         loop {
+-            input.skip_whitespace(); // Unnecessary for correctness, but may help try() rewind less.
+-            if let Ok(item) = input.try(&mut parse_one) {
++            input.skip_whitespace(); // Unnecessary for correctness, but may help try_parse() rewind less.
++            if let Ok(item) = input.try_parse(&mut parse_one) {
+                 results.push(item);
+             } else {
+                 return Ok(results);
+             }
+         }
+     }
+ }
+ 
+@@ -409,24 +409,24 @@ impl Separator for CommaWithSpace {
+ 
+     fn parse<'i, 't, F, T, E>(
+         input: &mut Parser<'i, 't>,
+         mut parse_one: F,
+     ) -> Result<Vec<T>, ParseError<'i, E>>
+     where
+         F: for<'tt> FnMut(&mut Parser<'i, 'tt>) -> Result<T, ParseError<'i, E>>,
+     {
+-        input.skip_whitespace(); // Unnecessary for correctness, but may help try() rewind less.
++        input.skip_whitespace(); // Unnecessary for correctness, but may help try_parse() rewind less.
+         let mut results = vec![parse_one(input)?];
+         loop {
+-            input.skip_whitespace(); // Unnecessary for correctness, but may help try() rewind less.
++            input.skip_whitespace(); // Unnecessary for correctness, but may help try_parse() rewind less.
+             let comma_location = input.current_source_location();
+-            let comma = input.try(|i| i.expect_comma()).is_ok();
+-            input.skip_whitespace(); // Unnecessary for correctness, but may help try() rewind less.
+-            if let Ok(item) = input.try(&mut parse_one) {
++            let comma = input.try_parse(|i| i.expect_comma()).is_ok();
++            input.skip_whitespace(); // Unnecessary for correctness, but may help try_parse() rewind less.
++            if let Ok(item) = input.try_parse(&mut parse_one) {
+                 results.push(item);
+             } else if comma {
+                 return Err(comma_location.new_unexpected_token_error(Token::Comma));
+             } else {
+                 break;
+             }
+         }
+         Ok(results)
+diff --git a/servo/ports/geckolib/cbindgen.toml b/servo/ports/geckolib/cbindgen.toml
+--- a/servo/ports/geckolib/cbindgen.toml
++++ b/servo/ports/geckolib/cbindgen.toml
+@@ -357,17 +357,16 @@ renaming_overrides_prefixing = true
+ "gfxFontFeatureValueSet" = "gfxFontFeatureValueSet"
+ "GeckoFontMetrics" = "GeckoFontMetrics"
+ "SeenPtrs" = "SeenPtrs"
+ "gfxFontVariation" = "gfxFontVariation"
+ "URLExtraData" = "URLExtraData"
+ "Keyframe" = "Keyframe"
+ "nsChangeHint" = "nsChangeHint"
+ "ServoElementSnapshotTable" = "ServoElementSnapshotTable"
+-"Keyframe" = "Keyframe"
+ "ComputedKeyframeValues" = "ComputedKeyframeValues"
+ "OriginFlags" = "OriginFlags"
+ "ServoTraversalFlags" = "ServoTraversalFlags"
+ "ServoStyleSetSizes" = "ServoStyleSetSizes"
+ "BeforeFlag" = "StyleEasingBeforeFlag"
+ "FontPaletteValueSet" = "gfx::FontPaletteValueSet"
+ "PaletteValues" = "gfx::FontPaletteValueSet::PaletteValues"
+ "ThinVec" = "CopyableTArray"
+