Firefox Addons - Kartones Blog

Amazon Container: Isolate Amazon activity to prevent tracking
Facebook Container: Isolate FB, Instagram, etc. activity to prevent tracking
Google Analytics Opt-out: Signal Google Analytics it shouldn't track you on websites using it
Google Container: Isolate Google activity from your normal one to prevent their tracking
Momentum: Beautiful and relaxing photos on the new tab
Temporary Mobile View: Switch an individual tab to the mobile version (Android/iOS/Kindle). Recommended CSS: body { margin: 5% !important }
Tracking Token Stripper: Removes Google Analytics (UTM) tracking tokens from URL query strings
Twitter Container: Isolate Twitter activity to prevent tracking
NoScript: Toggle javascript on/off for any domain. A must-have
uBlock Origin: Best Ad-Blocker extension
uMatrix: Proxy blocker to disable calls by subdomain and/or protocol

Disable media autoplay: type about:config and then check media.autoplay.default (set to 0) and media.block-autoplay-until-in-foreground (set to true) settings.
Force dark mode under Linux: type about:config and then create a new ui.systemUsesDarkTheme value of type Integer with value 1.
Short-term 3rd party cookies: Preferences -> Privacy & Security -> History -> custom settings -> and modify third-party cookies section
Tracking Protection: Preferences -> Privacy & Security -> Tracking Protection -> change to Always. Also block fingerprinting.
Enabling DNS-over-HTTPS