In Firefox I have:
- uBlock Origin: For blocking ads
- uMatrix: for blocking all kinds of stuff and to see what kind of connections each site uses (usually a ton)
- HTTPS Everywhere: to have https everywhere. According to @Jojonintendo this is already integrated into Firefox though, so I might delete it.
- Cookie Autodelete: pretty self-explanatory.
- Decentraleyes: to prevent websites from loading unnecessary resources.
- Privacy Redirect: mostly used to open Youtube links in Freetube, but also to redirect Reddit and Twitter links to libredd.it and Nitter respectively, when needed.