If I use arkenfox and make a bunch of overrides, do I need to make sure to back it up and manually install on every fresh installation or does Firefox Sync take care of that?
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Nope it doesn’t
Manually
What about extension settings? Is there a universal rule or is it per extension and up to them?
There is a ability, iirc for extensions to use your Mozilla Sync account for storing settings. However it´s up to each extension developr to include this.
You have to take care of your backup. Mozilla takes care about ai and translations.
To be honest I think it’s better they don’t sync these kind of things that are “hacky”. Someone who breaks his Firefox and don’t remember how should be able to make a fresh install to fix everything.