Firefox 81.1.0 includes the following changes:
Top sites from frequently opened sites #10342, and #14119 setting to toggle top sites, swipeable Top Sites carousel #14116
New search experience #13052
Find my downloaded files in the browser #349
External Download Manager #7620
Download improvements mozilla-mobile/android-components#8364
Select from multiple logins for a website for autofill #5551
Close tabs automatically after a certain amount of time passed #4118
Open in App contextual hint #9506
Disable autocomplete #5745
Surface notification controls in Firefox settings #139096
In-app review prompt #13507
Unlock previously set Primary Password, if set #13926