Extensions

I recommend running a few extensions to make your life better on the internet: 
 uBlock Origin 
 Best adblock extension on the market. Use this one, not any other. You can consider Ad Nauseam instead, but I recommend this one. 
Link: https://addons.mozilla.org/en-US/firefox/addon/ublock-origin/ 
 ClearURLs 
 This extension removes tracking elements from URLs. 
Link: https://addons.mozilla.org/en-US/firefox/addon/clearurls/ 
 Decentraleyes 
 This blocks website from requesting well-know websites (Google Hosted Libraries) for JS libraries and instead serves them locally. This addon complements adblockers like uBlock Origin. 
Link: https://addons.mozilla.org/en-US/firefox/addon/decentraleyes/ 
 Privacy Badger 
 Block and learns to block hidden trackers. 
Link: https://addons.mozilla.org/en-US/firefox/addon/privacy-badger17/ 
 Consent-O-Matic 
 Automagically denies cookies on most websites. 
Link: https://addons.mozilla.org/en-US/firefox/addon/consent-o-matic/ 
 CanvasBlocker 
 If not using LibreWolf or having enabled WebGL in LibreWolf, I recommend installing it. It prevents website from accessing a few things, like WebGL. 
Link: https://addons.mozilla.org/en-US/firefox/addon/canvasblocker/ 
 Don't Track Me Google 
 Removes Google's link conversion to see on which websites you clicked. 
Link: https://addons.mozilla.org/en-US/firefox/addon/dont-track-me-google1/ 
 SponsorBlock 
 Automagically skip sponsors (and more with some config) on YouTube videos. 
Link: https://addons.mozilla.org/en-US/firefox/addon/sponsorblock/ 
 Unhook 
 Remove all kinds of things from YouTube like shorts, comments, suggestions, etc. 
Link: https://addons.mozilla.org/en-US/firefox/addon/youtube-recommended-videos/ 
 YouTube No Translation 
 Disable auto-translation of titles, audio, descriptions, etc. 
Link: https://addons.mozilla.org/en-US/firefox/addon/youtube-no-translation/ 
 FastStream Video Player 
 Replaces your video player on streaming websites with a good one. 
Link: https://addons.mozilla.org/en-US/firefox/addon/faststream/