[prettymuchnoone]

by "Mozilla approved" do you mean that it has to come from the official add-on store?

because in my experience, it doesn't--I've installed a couple of extensions manually by just dragging the .xpi into the window.

[uyzstvqs]

Extensions in Firefox are required to be signed by Mozilla. If you make your own build of an open-source extension, it will not load. The setting to disable this check only works in Developer Edition, ESR and Nightly builds.

https://support.mozilla.org/en-US/kb/add-on-signing-in-firef...

[layer8]

What‘s wrong with ESR? I would recommend using ESR anyway.

[rpdillon]

Installing the developer edition seems like the move.

[Dylan16807]

Installing one of those builds is a deal breaker?