Indicated github should be used for collaborating.
Edited creating pgp key pair section.
Edited firefox installation instructions sections for ubuntu, max, windows.
Changed information on collaboration and editing to github rather tha…
Edited section for readability, increased recommended length pgp pass…
Edited section to improve conciseness and readability
Removed unused screenshots
Used direct firefox page in case mozilla ever change their front page
Edited section for readability and brevity
Manually upgrading firefox on ubuntu is for advanced users, who don't…
… need a guide to do it anyway
Fixed missing heading
Removed the suggestions of OperaTor and XeroBank as alternatives to TBB.
OperaTor is old and unmaintained.
I think XeroBank is also outdated, and more interested in selling their commercial vpn service.
Nice batch of edits, thanks @DanielKinsman!