>>105680895
It's new, only Firefox for Android have it.
Up until now we could only add predefined search engines.

>>105680930
I don't know who she is.

>>105680940
There may be other ways, but I can't think of any

>>105680950
-More customization: vertical tabs improvement, extensions button can be hidden, etc
-More speed: translation improvement, new Cookie API, new mouse pointer event, etc
-Bug fixes, stability and fine-tuning