The final push to start using Firefox over Chrome on Android might finally be thanks to the enormous selection of add-ons (Firefox’s version of extensions) coming out next month. Chrome doesn’t offer native support for extensions in its mobile app. Also, better security.
Don’t all modern browsers import data from your primary browser when you switch?
There is such a thing as a Firefox account, and your Firefox on your phone will know what your Firefox on pc was doing, etc if you’re logged in
I suppose you could do it manually if you want. https://takeout.google.com/