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Fennec uses 14.79 GB - how to clean up?
(discuss.tchncs.de)
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.
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If you use a Firefox account, you should be able to sync your history and stored passwords.
I use Fennec from F-Droid as well.
Don't know why you have so much user data. Maybe one of your extensions?
Thanks for sharing. I deleted all Add-Ons but it only slightly decreased.