This is really minor compared to other parts of Firefox. Notably, Firefox requires all extensions to be signed by Mozilla.
And the only way to turn that restriction off, is to either use Firefox Nightly or Firefox Developer Edition (which is a beta). If you want to use stable Firefox, because you like having a stable web browser, you just can't turn the restriction off. Period. The closest thing you can do is installing it as a "temporary extension" which uninstalls itself when the browser restarts.
It's kind of ridiculous that the default browser of most Linux distros has a Apple-esque mentality of "we get to tell you what you're allowed to install."
And the only way to turn that restriction off, is to either use Firefox Nightly or Firefox Developer Edition (which is a beta). If you want to use stable Firefox, because you like having a stable web browser, you just can't turn the restriction off. Period. The closest thing you can do is installing it as a "temporary extension" which uninstalls itself when the browser restarts.
It's kind of ridiculous that the default browser of most Linux distros has a Apple-esque mentality of "we get to tell you what you're allowed to install."