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Firefox

about:config settings I need

Disable YouTube Number Keyboard Shortcuts: Disables youtube's access keys to seek current video position with Alt+NUM
LocalCDN: An alternative to DecentralEyes. Serves fonts, javascripts like jquery which would be loaded from third-parties otherwise
WhatCampaign: Addresses containing Google Analytics parameters will be altered to protect your privacy: no buttons to press and no configuration required.
Stylus: CSS plugin write custom CSS and load sheets form userstyles.org
Tabby: Save and restore open tabs - rarely needed, but good to have
Tridactyl: Very powerful and feature rich vim-addon - highly recommended for vim users
uBlock origin: The well known ad-blocking addon