can you add firefox to this .. for some reason i can not get the chrome to work on my system.

I actually just started looking into porting it to Firefox. I haven't made any extensions for FF before - and this is my first Chrome extension as well - so I'm not sure how much work it'll be to convert it. But it's definitely on the top of my todo list.

The main difference between Chrome and Firefox extensions is that Chrome uses a callback-based API while Firefox's is based on promises. Other than that they're functionally the same aside from some differences in the manifest and the namespace (Chrome uses `chrome` while Firefox uses `browser`). I think Firefox has some backwards compatibility with the callback interface for easier porting but I haven't tried.

There's a nice polyfill by Mozilla so you can use their promise interface in Chrome but it was missing some important apis last I checked (sessions and optional permissions). https://github.com/mozilla/webextension-polyfill