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/
2) Did anyone audited the "HTTPS Everywhere" code?
3) Can someone trust this Add-on? Is it safe to install/use?
4) If it's so great why isn't it more prevalent?
What's youre opinion? Or answer? :\
Thanks!