Firefox

In addition to ublock,
I would also suggest

• decentraleyes
  Stores commonly used librarys localy,
  instead of downloading them from a third party.

• clearURLs
  Removes tracking parameters from links.

• google search fixer
  Shows the more advanced search features,
  That firefox for Android currently doesn't get

• video Background Play Fix
  What the name says,
  Good when you use youtube in the browser.

https://github.com/arkenfox/user.js/wiki/4.1-Extensions

One that is more specific to Lemmy, which I am working on

!instance_assistant@lemmy.ca

While this is extension is mine and I have an obvious bias, I am using the extension constantly for my personal use as well. Might be nice for others too :)

Ublock Origin and Adblock Plus

• My O'Reilly Downloader - if you have an account already, but want to persist some material to peruse at a later time
• TreeStyleTab
• ContainerProxy - I have mullvad running in gluetun container on my desktop PC, and it exposes HTTP proxy endpoint over Tailscale, so I can have VPN for my webbrowsing, without having to connect. This does not give me full protection, but I use tailscale a lot, and it doesn't play well with Mullvad.
• I Still don't care about cookies

Facebook Container, if you're like me and feel forced to use that godawful site because all your friends are still there.

Plus another vote for uBlock Origin (I have a feeling that one will come up a lot).

My 2 cents:

• LeechBlock - for blocking distracting websites on schedules
• Unhook - for hiding YouTube recommended videos, comments and other distractions
• Privacy Badger - for blocking trackers

• uBlock Origin
• ClearURLs
• Bitwarden
• ReturnYoutubeDislike