I updated the user.js-notify.sh script which checks for the user.js and user-overrides.js updates for Firefox and Thunderbird. The repo is here (script is in the /misc folder), the changes are here and the file can be downloaded here.
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Hi,
Thank you for the fix, I just tested it on my old laptop with Manjaro and it is showing ok now:
https://i.imgur.com/Qwvyhl9.png