Firefox Nightly adds CSS module scripts (#28277)

FF145 css import attribute

Author: hamishwillee

javascript/statements.json

@@ -1756,7 +1756,14 @@
                 },
                 "edge": "mirror",
                 "firefox": {
-                  "version_added": false,
+                  "version_added": "preview",
+                  "flags": [
+                    {
+                      "type": "preference",
+                      "name": "layout.css.module-scripts.enabled",
+                      "value_to_set": "true"
+                    }
+                  ],
                   "impl_url": "https://bugzil.la/1720570"
                 },
                 "firefox_android": "mirror",