I haven't done that myself, so you might want to wait for other replies which might agree or disagree with me. :)
I believe this is the latest
http://archive.trisquel.info/trisquel/pool/main/f/firefox/firefox_44.0.2+build1-0ubuntu0.14.04.1+7.0trisquel44.tar.gz
- [Trisquel-users] Installing Abrowser from source sradms0
- Re: [Trisquel-users] Installing Abrowser from sourc... jadedml
- Re: [Trisquel-users] Installing Abrowser from sourc... t8mf4nu6lizp
- Re: [Trisquel-users] Installing Abrowser from sourc... sradms0
- Re: [Trisquel-users] Installing Abrowser from sourc... d . a . capeletti