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This month will mark the end of DivestOS and its app
(divestos.org)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
Matrix space | forum | IRC
The current best option is Firefox Beta with about:config
Other options are iceraven which is normally several updates behind and the Iodé browser, which is up to date but I don't know much about it to blindfully use it to replace Mull, this is the Fdroid repo link
Hopefully some options show up before the next Firefox update.