Looking at the comments, interest in privacy and adblocking seem high. But the actual addons suggested here are often redundant or even worse, make you easier to track. Instead, take a look at the Arkenfox wiki, which is more or less the gold standard for browser privacy. Both LibreWolf and Mullvad Browser, practically the most privacy/anonymity oriented browsers out there, right behind Tor, either rely on it or stick very closely to it.
I highly recommend reading the entire wiki from the start. You dont have to do everything it says, obviously, but even if you dont do anything it will give you a better understanding of browser privacy. And lastly, do not use Chrome or any chromium based browser if you care about privacy and a free and open internet. Even if you only use a chromium based browser, you help increase googles monopoly.

• AdGuard Extra

• AdNauseam (uBlock Origin fork)

• Bitwarden

• Clickbait Remover for Youtube

• Custom Scrollbars

• Don’t accept image/webp

• Enhancer for Youtube

• Proton VPN

• RES

• Return Youtube Dislike

• Sponsorblock

• Thumbnail Rating Bar for Youtube

• Tree Style Tab

• Translate Web Pages

• uBlacklist (no more deviantart trash in image search)

• Redditsave (probably won’t need this anymore since i moved here)

• vidIQ Vision for Youtube (information on screen pleases me)

• Violentmonkey

• Youtube-shorts block

and thanks to the based commenters here, learned there were some userscripts for kbin and got the Dark Reader extension

Here’s my list. Using OperaGX.

• Bitwarden
• Buster
• Consent-O-Matic
• Dark Reader
• FastForward
• Picture-in-Picture
• Stylus
• TamperMonkey
• The Stream Detector
• uBlock Origin
• Session Buddy
• Return YouTube Dislike
• Looper for YouTube

Browser: Firefox, gonna name stuff i don’t see mentioned yet

‘Multi Account Containers’ + ‘Container Tabs Sidebar’ + ‘Switch Container’ + ‘Temporary Containers’ + ‘don’t care about cookies’ ‘Consent-o-matic’
basically allows you to easily have multiple accounts on websites while also making sure everything stays contained to its own bubble, and anything I don’t have a dedicated container for gets a temporary container that deletes the cookies after a bit in order for me to both not care about cookies and also not get any cookies. at this point mostly because I don’t like accidentally having an account on a non-contained instance

ff2mpv - easily launch videos in mpv, requires a bit of setup

Image Search Options - finding the source of most drawings, spotting which anime a clip is from etc

Yomichan for quick access to locally installed dictionaries (for Japanese in this case)
Toggle Clipboard

I’m using Firefox:

1. uBlock
2. Darkreader
3. Privacy Badger
4. NoScript
5. uMatrix
6. Bookmark Dupes
7. CanvasBlocker
8. ClearURLs
9. YT Enhancer
10. FF Relay
11. Open in Private Mode
12. Open Tabs Next to Current
13. Secure Password Generator
14. Toggle web custom fonts