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Does Firefox Sync save user.js and overrides?
(lemmy.zip)
A place to discuss the news and latest developments on the open-source browser Firefox
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.
Yes, turns out you need to manually enable in ublock and then manually export your rules yourself. Better than nothing, I guess.