Solved
how to fix "xpinstall.signatures.required" ive turned it off but it keeps blocking the add-on file
trying to install an add-on by file and I have turned off the signature thing, I also reinstalled firefox but the same issue keeps happening. it was able to install correctly on the zen browser which I think is built on firefox but idk.
trying to install an add-on by file and I have turned off the signature thing, I also reinstalled firefox but the same issue keeps happening. it was able to install correctly on the zen browser which I think is built on firefox but idk.
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الحل المُختار
This only works in developer builds. (You seem to be running stable release version.)