Unpacked Unsigned XPI addon how to add to Firefox during developing?

Unpacked Unsigned XPI addon - how to add to the latest version of Firefox during developing?
It just removes my addon folder from Firefox addons folder

Temporary Add-on function in about:debugging#addons works only for WebExtensions & bootstrap

You will have to use a special build of Firefox that allows the preference for disabling signature verification to be disabled to test on release and beta: https://wiki.mozilla.org/Add-ons/Extension_Signing#Unbranded_Builds

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Good