FF sync not correctly syncing

[paponius]

Describe the bug
Added and modified (settings) profile, did not correctly sync to another PC

To Reproduce
Created new profile (no previous changes to the settings)
changed save to ... google drive (actually changed a lot. also tried dav),
but before switching to another PC, google drive was selected as save to for this new profile
on another PC, profile did sync, but

1. there were not options to use the new profile on right click on page
   I did turn off/on the plugin in FF manage extensions page, which did help and the option appeared
2. selecting the profile still saved to Download dir.
   I changed the new profile on this second PC to other options, it still saves to disk
   I switched the second PC's destination on Default profile to Google Drive, which worked (not really, see other issue)
   I switched again to the new profile on second PC, it still only saves to Download dir.

restart of the browser fixed the issue.

Expected behavior
sync would sync correctly without

Environment

• OS: Win10 Pro/11 Pro
• Browser: Firefox
• Version: 64 (most recent)
  (the same for the previous bug. tested on both 10/11

Additional context
let me know if needed. I wrote in hurry

[gildas-lormeau]

Thank you, I will some tests to reproduce and check what could be wrong. It could take some time because it's not easy to test this feature.