I'm referring to Android versions. No extensions allowed on Android Chrome, but Kiwi does. Android Firefox allows some small number of extensions, but IceRaven allows many more.
Or eg. for BandCamp I wrote a script that hides the play progress bar so that I can actually focus on the music instead of how many seconds of music there are left.
Have you tried out LibreWolf? By default its a bit hard to use since it doesnt save passwords or history or cookies or anything, but you can turn all that on. Its a fork of firefox meant to be more privacy focused. You can still use your firefox account and everything im pretty sure.