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Updates to Android Navigation
(connect.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
Though if they're smart about this, they'll remove that the back gesture goes back a webpage, and instead make it go back a screen (say back into settings or home or out of the app), so it's consistent with other apps.
Consistent with other apps is going one step back like it is handled now. I don't know apps acting in another way