I personally find this feature brilliant.

And it is one of the reasons I use FF on Android

IIRC a double tap on a link opens the browser.

Oh, I didn't know what's called. Thank you.

What is tab queue? Is that the new feature or is that the old feature that gp was complaining about?

What are the new features?

It's the feature they were complaining about. It's useful if you're in some other apps (e.g. a feed reader) from which you want to open several links in a row, which you then work through in order afterwards within Firefox.

Disabling the tab queue means tabs get directly opened again.