Same here.
However, it seems to work when you manually backup your bookmarks by
Bookmarks = Organize Bookmarks... = Import and Backup = Backup... and
save the .json file somewhere.
I noticed that the .json stored in bookmarkbackups has the same time
stamp
My version is
I followed the instructions on
http://kb.mozillazine.org/Bookmarks_not_saved
and it worked for me.
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Firefox fails to save book marks!
https://bugs.launchpad.net/bugs/356988
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