diff --git a/extra/firefox/build b/extra/firefox/build
index 02b0465b..80ea0fd0 100755
--- a/extra/firefox/build
+++ b/extra/firefox/build
@@ -44,11 +44,6 @@ case $("$CC" -print-file-name=libc++.so) in */*)
     export CXXSTDLIB=c++
 esac
 
-# Bypass 'ccache' as it's totally useless when building
-# Firefox and only slows things down.
-export CC="${CC:-/usr/bin/cc}"
-export CXX="${CXX:-/usr/bin/c++}"
-
 export LDFLAGS="$LDFLAGS -Wl,-rpath=/usr/lib/firefox,--enable-new-dtags"
 export RUSTFLAGS="$RUSTFLAGS -Cdebuginfo=0"
 export MACH_USE_SYSTEM_PYTHON=1