Consent-O-Matic★★★★★Convenient browser extension that detects cookie consent pop-ups and automatically fills them out according to your choices. Lets you know it’s working without getting in your way.
Floccus Bookmarks Sync★★★★★Very flexible, syncs across many different desktop browsers and mobile devices, and for privacy it can run on your own server or encrypted on another cloud service.
KeePass Password Managers★★★★★KeePassXC, its browser extension, and KeePass2Android are a nice, clean set of apps to manage your passwords on your OWN desktop and mobile devices, auto-fill websites and apps, and sync over your own server or cloud provider.
Mastodon – Simplified Federation★★★★★A Firefox add-on that automatically opens remote Mastodon users or posts in your home server when you interact with them.
Pocket (discontinued)★★★☆☆I used Pocket for ages to better manage my time reading articles. Eventually I soured on the way it’s turned into a recommendation engine. And now Mozilla’s discontinuing it. Wallabag is a decent alternative for the read-it-later aspect.
Privacy Badger★★★★★Tracking protection add-on for web browsers that also converts embedded media to placeholders and adds GPC support to browsers that don’t have it built in. (It used to detect new trackers automatically, but had to stop when someone figured out how to track that.)
Wallabag★★★★☆A read-it-later type service built on open-source software that you can run yourself if you want (but don’t have to). Not as polished as Pocket, but it’s sticking around, and you know it’s not using your saved bookmarks to train a recommendation engine.
Wayback Machine Browser Extension★★★★☆Useful for when you want to make sure the pages you’re reading will still be around in some form in the future, and to easily get at additional context. Checks every page you view against the Wayback Machine, so turn it off when you’re not using it.
Xmarks (Discontinued)★★★★☆Xmarks was a cross-browser bookmark sync service that I used for a long time to keep Chrome, Firefox, IE, and Safari on multiple computers using the same set of bookmarks. It shut down in 2018.