The complete list:

• 600% Volume
• ClearURLs
• Decentraleyes
• LanguageTool
• linkding Extension (only if you have a self-Managed linkding instance)
• NopeCHA
• Privacy Badger
• SponsorBlock
• SurfingKeys
• TranquilityReader
• uBlock Origin
• FastForward
• Youtube NonStop

600% Volume. To boost the sound in our browser

Get it here: https://addons.mozilla.org/en-US/firefox/addon/600-sound-volume-privacy/

ClearURLs

Get it here: https://addons.mozilla.org/en-US/firefox/addon/clearurls/

Decentraleyes

Get it here: https://addons.mozilla.org/en-US/firefox/addon/decentraleyes/

LanguageTool. It is a free Grammarly!

Get it here: https://addons.mozilla.org/en-US/firefox/addon/languagetool/

Linkding. It allows you to save bookmarks in this helpful bookmark tool. But you have to deploy your own linkding instance somewhere!

Get it here: https://addons.mozilla.org/en-US/firefox/addon/linkding-extension/

NopeCHA

Get it here: https://addons.mozilla.org/en-US/firefox/addon/noptcha/

Privacy Badger

Get it here: https://addons.mozilla.org/en-US/firefox/addon/privacy-badger17/

SponsorBlock

Get it here: https://addons.mozilla.org/en-US/firefox/addon/sponsorblock/

Surfingkeys. The best extension to navigate using your keyboard!

Get it here: https://addons.mozilla.org/en-US/firefox/addon/surfingkeys_ff/

Tranquility Reader

Get it here: https://addons.mozilla.org/en-US/firefox/addon/tranquility-1/

uBlock Origin

Get it here: https://addons.mozilla.org/en-US/firefox/addon/ublock-origin/

FastForward. Bypass link shorteners. Useful to download pirate games through tons of links!

Get it here: https://fastforward.team/

Youtube NonStop

Get it here: https://addons.mozilla.org/en-US/firefox/addon/youtube-nonstop/