freeyourstuff.cc
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Firefox version
Most of your libre users are using a libre browser :P
It should be doable, since FF now supports a largely Chrome-compatible extension API. Definitely something I'd be happy to collaborate on, but a bit too big to take on by myself right now.
https://developer.mozilla.org/en-US/Add-ons/WebExtensions
Chromium (not Chrome) is 100% free software, BTW.