You can keep your extensions loaded by setting this about:config value to false: xpinstall.signatures.required At least I think thats the one. Also extension

You can keep your extensions loaded by setting this about:config value to false: xpinstall.signatures.required At least I think thats the one. Also extension updating can be disabled globally or on a per extension basis in the addons setting page. Edit: note that you have to package (zip) the extension. You can't keep an unpacked extension loaded.