Neither of those things happens with me. Was this something recent? Could possibly be something in the settings if you want to try resetting to default.

adding extensions on top of that state is not going to help

While Firefox mobile always had ublock origin, I don’t think I could use a mobile browser without UBO. Having a banner, autoplay video and many interstitial ads pop up on an already small screen would make the web unusable. It also deals with annoyances on like Fandom’s featured videos, Reddit mobile’s shenanigans, etc. So even if I had those issues, I’d probably work through them for the extensions