Ok. It's a Firefox Add-on:
https://www.eff.org/https-everywhere
Questions:
1) But: Why can't i find it on the offical Firefox Add-ons site?:
https://addons.mozilla.org/en-US/firefox/
Because you're looking in the wrong place. It is wrong to assume that
100% of XPIs are hosted at AMO. Most are, but not all.
2) Did anyone audited the "HTTPS Everywhere" code?
It's written by the TorProject team, who wrote Tor, and TorButton. If
you trust Tor, and Firefox, and the EFF, you might like this.
3) Can someone trust this Add-on? Is it safe to install/use?
See 2.
4) If it's so great why isn't it more prevalent?
See 1 and 2.
What's youre opinion? Or answer? :\
Tor project hosts the plugins source code. They have it under Git
version control, bugs in Trac. You need to be on the Tor dev and commits
list to see the activity. EFF hosts a user mailing list (and one for rules).
https://blog.torproject.org/blog/https-everywhere-firefox-addon-helps-you-encrypt-web-traffic
https://gitweb.torproject.org/https-everywhere.git
https://trac.torproject.org/projects/tor/query?status=accepted&status=assigned&status=new&status=reopened&groupdesc=1&group=type&max=200&component=EFF-HTTPS+Everywhere&order=priority&col=id&col=summary&col=component&col=status&col=type&col=priority&col=milestone&report=19
https://mail1.eff.org/mailman/listinfo/https-everywhere
https://mail1.eff.org/pipermail/https-everywhere/2011-January/000732.html
https://mail1.eff.org/mailman/listinfo/https-everywhere-rules
HTH.
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