You can still use firefox autoconfig scripts to do a lot of things that they locked down(like using old XUL apis) https://support.mozilla.org/en-US/kb/customizi

You can still use firefox autoconfig scripts to do a lot of things that they locked down(like using old XUL apis) https://support.mozilla.org/en-US/kb/customizing-firefox-using-autoconfig#w_functions-of-autoconfig https://support.mozilla.org/en-US/kb/customizing-firefox-usi...