Fix Firefox Proxy Extension

I have a custom Firefox proxy add-on that used to work flawlessly, but today it no longer connects to the proxy at all. The proxy host, port, user, and password are entered manually in the add-on’s settings; nothing else about the workflow has changed, so the fault is inside the extension code, not the proxy itself. I will send you the current source (.xpi and unpacked files) as soon as we start. I need you to locate the breakage, patch it so the browser actually routes traffic through the entered proxy again, and return a working signed build (or clear instructions for temporary loading in developer mode). This is genuinely time-critical: I must receive a functioning build within two hours of contract start. If you are confident you can meet that window, begin your proposal with “URGENT” so I can spot you instantly. Quick screen-share testing is available if that helps you verify the fix before delivery. Deliverable: repaired Firefox extension that connects through the manually entered proxy, plus a brief change log of what you touched.