Hi Sean, I've looked at the git repository on salsa, and your last commit:
https://salsa.debian.org/daniel-guest/ublock-origin/commit/0b9e4452552ce6243ae088a7880ef4d67c82d5f8 fixes this for sid (provided one has fonts-font-awesome 4.x which got recently re-uploaded; it works flawlessly but doesn't display icons in the popup when using fonts-font-awesome 5.x). would you mind the fix? Regards, Daniel