Firefox has a plugin called I Don't Care About Cookies, Which basically just ignores the pop-ups and auto except / rejects them, but for some strange reason that plugins you can add to the mobile version of Firefox are extremely limited.
Essentially the plugin implements the functionality that should have been mandated under the cookie law to begin with which makes the choice browser side rather than web side
I think it's just the default Firefox for Android font, my system font is the third option in the styles settings of Android 11 but idk if that affects it.
If you want more addons on mobile you can use Nightly and create a custom addon collection. However the nightly app gets updated daily and you have to get a firefox account so be warned