firefox-prefs-differ

1. ./download_firefox.sh 149.0
2. ./podman-run.sh 149.0
   • build the image first if it is outdated: podman build -t firefox-prefs-differ -f Containerfile
3. Ctrl+Shift+K and paste about_config_extractor.js
4. wl-paste > all-prefs-149.0.js
5. ./smart_differ.py 148.0 149.0