diff --git a/extra/firefox/build b/extra/firefox/build
index c7e84ee6..fef79673 100755
--- a/extra/firefox/build
+++ b/extra/firefox/build
@@ -67,7 +67,6 @@ ac_add_options --disable-system-extension-dirs
 EOF
 
 ./mach build
-./mach run
 DESTDIR="$1" ./mach install
 
 # Remove a lot of uneeded "stuff".