A great, but underutilized feature of Firefox (on PC at least) are the profiles.
I usually have four or more profiles, each with its own settings, plugins, themes, etc.
I don't need my password manager and social media stuff, css tools, et al for my browser that I use just for getting my daily webcomic fix, for instance.
My shopping profile dumps all cookies when it closes. Stuff like that.
@DelilahTech Ditto. Also one each for dev, test and production on my work PC. 😁