[GlennS]

It seems to me like Firefox has a lot of tiny delays everywhere, and they're just long enough to be distracting. It's like going back to a hard disk after having used an SSD.

On the other hand, Firefox Focus on mobile seems to run pretty fast and comes with enough ad blocking to make the web bearable.

If it had either tabs or a way to open multiple processes then I would probably ditch the other mobile browsers.

[NoGravitas]

I love Firefox Focus, but it's not suitable for your main mobile browser. What it is is a substitute for Chrome Custom Tabs.

Full Firefox on Android has a slow startup time if it's been pushed out of memory, which it usually is, because it's big. Firefox Focus is a way of quickly opening links from other apps without paying the cost of opening Firefox, while keeping an acceptable level of ad-blocking and privacy.

You should have both installed, set Focus as your default browser, but liberally use the "Open in Firefox" menu on Focus when you have real browsing to do.