The Tor browser is based on firerfox and is the best option right now if you are very serious about the privacy.

Be aware that enhanced privacy is reached at the cost of webpage loading speed, convenience of awesome-bar, and some other shortcomings.

You can find Tor at https://www.torproject.org/

If you do not want to completely get into Tor, you can try in install some https addon and use more of firefox's private mode.

i hear your response. i disagree though. Here is why....

If Firefox was truly serious about privacy, they would make TOR a first class citizen and make it a standard feature on the browser. Now i am not saying it should be turned on by default. Just that it needs to be there.

Not up for discussion in this support forum. Tor is a separate project that is "based" upon Firefox; Mozilla has no official involvement in that project.

You can provide feedback to Mozilla here as to what features Firefox "should have": https://input.mozilla.org/en-US/feedback