As suggested by @r_oVhPfcJCUUC5wbm6i4_C2Q here, Im opening a new thread here to discuss the further possibilities of the Rep Companion by @bking Add-On for Firefox which is not compatible with Firefox 21 and up.
As Im not a developer, Im not sure what reasons there might be, but as far as I know it wont take too long to fix.
Add-On:
https://addons.mozilla.org/en-US/firefox/addon/mozilla-reps-companion/?src=search
GitHub Repository:
https://github.com/brianking/ReMo-Helper
Also bringing up the etherpad by Brian again:
https://remo.etherpad.mozilla.org/companion-addon-feedback?