I am trying to make an extension for my personal use. I started writing a couple lines of code and it works in google chrome, but the same extension gives me an error on firefox. The extension needs only a background script and needs to listen for tab creation events. I went to about:debugging and clicked on "Load temporary add-on" and selected my extension's manifest file, it loads, but the console.log calls doesn't work. I noticed it gives me a warning Loading failed for the <script> with source “moz-extension://....../background.js”. with the if of the extension. I looked a bit on the internet and disabled all addons and started firefox in safe mode, but the warning still persists. I tried to add a background page instead of a script and just calling console.log in that but that still didn't work. In the end, I went to mozilla's example extensions webpage and installed a couple of them, but none of them worked, so the problem isn't in my code. Is there any way i can fix this? I can't get a more descriptive error than laoding failed.