I don’t use any that do the things you mentioned, but I have some other addons that could be useful.

This one is extremely entertaining: Billionaire-to-oligarch replacer

Other than that, I have:

• Dark Reader: This automatically generates CSS to make a dark mode for any website. It breaks sometimes, but not often, and it can be turned off for sites that it breaks.

• Violentmonkey: This is a userscript addon. It allows you to run scripts when certain websites load. I use it for fixing websites that are broken or do something stupid like changing my volume automatically without a setting to stop it (YouTube).

• uBlock Origin: I use this rather than other content blockers because it is faster, uses less RAM, and is open source

• LocalCDN: This downloads commonly-used frameworks when you visit a site using them, and on subsequent visits to sites that use that framework, it’ll just get the downloaded version instead. This allows you to use less bandwidth, have websites load faster, and increases your privacy. It does take some drive space though.

• ClearURLs: This removes tracking from URLs.

• CanvasBlocker: This disables and modifies certain javascript APIs to prevent sites from using them to violate your privacy. It can break sites, but it can be turned off for sites it breaks if needed.

• KeePassXC-Browser: This connects to the open-source password manager called KeePassXC to provide autofill passwords and a secure password generator.

• Multi-Account Containers: This uses Firefox’s container feature to force certain sites to open in specific containers. For example, I have my school-related sites open in a school container. This means anything I do there won’t affect anything else I do outside of that container.