All open bookmarks lost

[mindthump]

When Firefox updated to 134.0 (1/10/2025) all open bookmarks were lost. The "Other Bookmarks / Simple Tab Groups" is missing all bookmarks from open (non-archived) groups. Archived groups are untouched.

When I try to bring up the Settings next to the "Manage Bookmarks" item in the drop-down menu nothing happens. "Manage Bookmarks comes up with empty groups. The Settings 'gear' doesn't work there either.

To Reproduce
Can't reproduce myself, they are just gone

Expected behavior
Don't lose my bookmarks, ever. Settings window opens when the 'gear' icon is clicked.

Screenshots

Desktop (please complete the following information):

• macos 15.1.1 (24B91)
• Firefox 134.0
• Simple Tab Groups version: can't tell because the settings won't open

Additional context
None.

[mindthump]

When I restored bookmarks through Firefox from a backup, STG did not update; it still shows Tab Groups as empty.