I like librejs

I use Firefox, but I’m quite confident all of these add-ons are available on chromium-based browsers too:

• uBlock origin - I guess we all know what it does
• imagus - allows to preview direct urls to images/videos by holding CTRL (or hovering them)
• vimium - press F to have all the clickable elements of a webpage bind to a keys combination. Basically allows to navigate webpages with the keyboard
• old reddit redirect - force reddit to display the old UI by redirecting pages to old.reddit.com
• privacy redirect - force-redirects you to the privacy-respecting alternatives to YouTube, Twitter, Intagram, Maps
• sponsorblock for youtube - crowdsourced extension that allows to skip product placements in YT videos
• web archives - allows to see the archived version of a webpage on multiple providers
• bitwarden’s browser extension if you use it
• temporary containers - allows to create a temporary container if you quickly need to isolate a site from the rest of your browser storage (firefox only obv)
• Translate Web Pages - found out about this a few days ago. Works good, I’ve been using it quite often and it’s pretty cool

Edit: added a few extensions to the list