I was able to download and install the XPI, but when I restart Firefox it doesn’t seem to be working (the menu item is not added). I’m using the Developer Edition, should I be using standard Firefox instead for these tutorials?
I didn’t have a thorough look at the add-on but it might be not working in recent versions of Firefox. I currently don’t have time to fix it as I am busy reviewing productive add-ons for signing.
I don’t have a Mozilla persona account (or whatever is the service name) and, between the participants in that thread, I recognized only your username so I’m comment you this via (sorry if it’s not ok): I checked the source of that addon and it never apply a overlay to the main menu; instead, it tries to play a bit with a network-monitor service: https://addons.mozilla.org/en-US/firefox/files/browse/146909/file/content/browserOverlay.js
I’m not sure what happened here… can you check it, or comment in that thread and to help with what happened?
It’s not really malicious, but it does a bunch of things the original doesn’t, so I’m disabling it for now. We’ll need to figure out what to do about it, though, since it’s using the same ID as the original. This tutorial will probably be deprecated very soon anyway.