I would respectfully suggest supporting the Pale Moon browser. Initially based on Gecko browser engine, Pale Moon is now a complete split from Firefox. Pale Moon is available in 32 and 64 bit versions for Windows and Linux and is struggling to get an OS X version running as well. In addition, Pale Moon now has an android version available, based on Fennec.

Pale Moon has not adapted the "Australis" user interface, instead it strives to provide a fast and solid UI. Pale Moon also provides it's own syncing service, which does not utilized Mozilla's sync engine or servers. While most FF extensions are compatible with Pale Moon, some are not, therfore Pale Moon has is own extension hosting server.

Pale Moon is completely open source and is primarily user supported.

Thanks for your consideration.
posted by x.15a2 Community Leader4 years and 1 month ago Link

Your primary issue appears to be that Firefox utilizes Mozilla services, such as sync. Sync data is fully encrypted on Mozilla's servers and only the user has access to it. Mozilla is also pretty strong end-user privacy advocate.
posted by <hidden> • 4 years and 19 days ago Link