diff --git a/browser_patches/firefox/build.sh b/browser_patches/firefox/build.sh
index c00a1f5c84..693f1bba03 100755
--- a/browser_patches/firefox/build.sh
+++ b/browser_patches/firefox/build.sh
@@ -3,7 +3,6 @@ set -e
 set +x
 
 RUST_VERSION="1.59.0"
-CBINDGEN_VERSION="0.24.3"
 
 trap "cd $(pwd -P)" EXIT
 
@@ -117,62 +116,36 @@ if [[ -z "${IS_JUGGLER}" ]]; then
     rustup install "${RUST_VERSION}"
     rustup default "${RUST_VERSION}"
   fi
-
-  # TODO: cargo is not in the PATH on Windows
-  if command -v cargo >/dev/null; then
-    echo "-- Using cbindgen v${CBINDGEN_VERSION}"
-    cargo install cbindgen --version "${CBINDGEN_VERSION}"
-  fi
 fi
 
 if [[ -n "${IS_FULL}" ]]; then
-  if is_mac; then
-    echo "ac_add_options --enable-bootstrap" >> .mozconfig
-  else
-    # This is a slow but sure way to get all the necessary toolchains.
-    # However, it will not work if tree is dirty.
-    # Bail out if git repo is dirty.
-    if [[ -n $(git status -s --untracked-files=no) ]]; then
-      echo "ERROR: dirty GIT state - commit everything and re-run the script."
-      exit 1
-    fi
-
-    # 1. We have a --single-branch checkout, so we have to add a "master" branch and fetch it
-    git remote set-branches --add browser_upstream master
-    git fetch browser_upstream master
-    # 2. Checkout the master branch and run bootstrap from it.
-    git checkout browser_upstream/master
-    SHELL=/bin/sh ./mach --no-interactive bootstrap --application-choice=browser
-    git checkout -
-    rm -rf "${OBJ_FOLDER}"
+  # This is a slow but sure way to get all the necessary toolchains.
+  # However, it will not work if tree is dirty.
+  # Bail out if git repo is dirty.
+  if [[ -n $(git status -s --untracked-files=no) ]]; then
+    echo "ERROR: dirty GIT state - commit everything and re-run the script."
+    exit 1
   fi
 
+  # 1. We have a --single-branch checkout, so we have to add a "master" branch and fetch it
+  git remote set-branches --add browser_upstream master
+  git fetch browser_upstream master
+  # 2. Checkout the master branch and run bootstrap from it.
+  git checkout browser_upstream/master
+  echo "ac_add_options --enable-bootstrap" >> .mozconfig
+  SHELL=/bin/sh ./mach --no-interactive bootstrap --application-choice=browser
+  git checkout -
+  rm -rf "${OBJ_FOLDER}"
+
   if [[ -n "${WIN32_REDIST_DIR}" ]]; then
     # Having this option in .mozconfig kills incremental compilation.
     echo "export WIN32_REDIST_DIR=\"$WIN32_REDIST_DIR\"" >> .mozconfig
   fi
 fi
 
-# Remove the cbindgen from mozbuild to rely on the one we install manually.
-# See https://github.com/microsoft/playwright/issues/15174
-if is_win; then
-  rm -rf "${USERPROFILE}\\.mozbuild\\cbindgen"
-else
-  rm -rf "${HOME}/.mozbuild/cbindgen"
-fi
-
-
 if [[ -n "${IS_JUGGLER}" ]]; then
   ./mach build faster
 else
-  export MOZ_AUTOMATION=1
-  # Use winpaths instead of unix paths on Windows.
-  # note: 'cygpath' is not available in MozBuild shell.
-  if is_win; then
-    export MOZ_FETCHES_DIR="${USERPROFILE}\\.mozbuild"
-  else
-    export MOZ_FETCHES_DIR="${HOME}/.mozbuild"
-  fi
   ./mach build
   if is_mac; then
     FF_DEBUG_BUILD="${IS_DEBUG}" node "${SCRIPT_FOLDER}"/install-preferences.js "$PWD"/${OBJ_FOLDER}/dist