add user.js from pyllyukko/user.js

[nodiscc]

Adds Firefox configuration from https://github.com/pyllyukko/user.js

• Over 100 documented configuration settings
• Certificate store cleanup script
• Prevents reinventing the wheel :)
• Fixes Disabling referer headers #12
• Fixes [Request] Explanations for each option #1

[amq]

Sometimes it is good to have different projects on a similar thing.

Personally, I think that user.js from pyllyukko is overworked and can cause different random issues.

[amq]

Especially considering

Main goals
[...]
Still be at least somewhat usable in daily use

My primary goal is to keep the browser completely usable and just debloat it from unneeded features that leak information.

[nodiscc]

I see your point @amq, pyllyukko's user.js has tight settings and can cause browsing problems. If you want to provide a more relaxed configuration, why not start from his work and remove/edit settings you don't agree with?

This way the 2 projects could share progress.