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Firefox also automatically blocks users from installing or editing their own add-ons.

I too find this to be a hostile action against the user. It's my computer.

It’s for common-case user security. Use the developer edition if you want to install unsigned extensions.

I have never seen this, so citation needed.

I think the GP is referring to not being able to install non-signed add-ons in non-developer versions of Firefox.

I don't know, my non-dev version has an "install addon from file" menu item.

Are you sure Firefox doesnt check the signature if you use that menu item?

I'm pretty sure, as I haven't signed my extensions before loading them.

Yes. You have to have mozilla sign your add-ons after every little edit you make or use the beta/dev with bugs.