Push to Kindle sends any text article to PDF or to your ereader (not only Kindle)
Recipe Filter filters recipe pages on blogs and just gets the actual ingredients & instructions
Redirector for a few paywalls where I use a specific proxy
RSS Reader Extension (by Inoreader) - as I use Inoreader for following RSS feeds
Sci Hub Injector adds sci-hub links to many science publishing websites for easy access
Shinigami Eyes highlights trans-friendly and transphobic social media users or websites
uBlock Origin
ViolentMonkey for userscripts
Extensions to be helpful to other people:
Picket Line Notifier tells you if the website you are visiting has workers on strike - useful especially for ecommerce & news publishers
Snowflake is not noticeable for me, but allows other people to use my network as a Tor node or something idk
Wayback Machine archives every page I visit on the Internet Archive.
Fediverse extensions:
FediAct allows me to boost, reply to, follow, etc. on any Mastodon instance without having to open the right link in my own instance. I wish there was something like this for Lemmy and Peertube.
Fedishare allows for one-click sharing to several Fediverse platforms, including Lemmy and Mastodon
PeerTubeify tries to check if a YouTube video you're watching is also on PeerTube
Youtube extensions:
Auto HD / 4k / 8k pour YouTube™ - I use it for the environment, so default quality is 480px (because usually I watch the videos on a small side window so it doesn't change the visible quality)
Clickbait Remover for YouTube - replaces thumbnails with a frame from the video and makes all titles normally named, no all caps
DF YouTube (Distraction Free) - removes the homepage & sidebar on videos to avoid rabbit holes
SponsorBlock auto-skips sponsored segments, intros, credit rolls, etc. on YouTube videos
uBO, of course. note: you guys don't need ClearURLs with this list added. LibRedirect for automatically opening Youtube, Twitter, TikTok etc. links in their privacy-focused front-ends. I just make sure to disable all the instances by esmailelbob since he's a little homophobic shithead Buster for automatic captcha solving Consent-O-Matic automatically clicks through cookies banner to deny all the cookies that aren't necessary, which I like better than just hiding the cookie banner Redirect AMP to HTML because fuck AMP and fuck Google
DownThemAll lets you download all the links or images on a website and much more: you can refine your downloads by fully customizable filters to get only what you really want.
Comes in really handy sometimes. (For Firefox / Chrome / Edge)
Another is uBlacklist, which allows you to blacklist domains from Google / Bing / DDG search results (like say, pinterest.*), also for Firefox / Chrome / Edge.
I use the following ones (on Firefox), except for uBO the others are just for conveniency:
Bitwarden
Gesturefy (for some time from early 2021 to late 2022 I used to use Vivaldi as my primary browser and now if I'm using a mouse, not having gestures in a browser feels odd...)
LibRedirect
Plasma Integration
uBlock Origin (middle mode and with some additional lists)
User-Agent Switcher and Manager (if I find a site that says it doesn't work with Firefox).
Consent-O-Matic - Automatically marks my saved cookie preferences on consent pop ups. This is a great tool to help counter to the dark patterns related to GDPR, but it isn't perfect. {MIT}
NoScript - I don't like giving blanket permission to run JavaScript in my browser. This let's me choose. {GPLv3}
Wayback Machine by Internet Archive - Archives the sites I visit automatically and provides a one click option to visit an archived version of a URL that returns 404. {Proprietary | I don't know of any alternatives}
Tampermonkey - There are a few very useful scripts that I run periodically. Tampermonkey keeps them organized and easy to run. {Proprietary | I don't know of any alternatives}
Reddit Enhancement Suite - I got a lot of value from this extension over the years, but I don't know how much value it has going forward for me {GPLv3}