behind! - makes it easy to access images hidden under layout tricks

Better Youtube+ - adds a few extra buttons such as download to youtube videos

Bypass Paywalls - as it says on the tin

Cookiebro - autodeletes all non-whitelisted cookies ten minutes after creation

Greasemonkey - enables userscripts, specifically:

 Anti-Adblock Killer - as it says on the tin

 EmuParadise Download Workaround - Nintendo made them hide the links, this shows them. May not be relevant anymore, haven't used it in a while

 Old Wikipedia Layout - edits all wikipedia links to include ?useskin=vector so it doesn't use the garbage new layout

 Redirect Twitter to Nitter - as it says on the tin, turns all twitter links to corresponding nitter links

 Simple Youtube Age Restriction Bypass - as it says on the tin

Privacy Badger - EFF tracker blocker

Return Youtube Dislike - as it says on the tin

SponsorBlock for Youtube - uses crowdsourced timestamps to block in-video youtube ads

uBlock Origin - basic/main adblocker