hello, do you use any external clean-up or sandboxing software that might interfere here?

Problems with bookmarks and history not working properly can be caused by a corrupted places.sqlite database file.

You can check for problems with the places.sqlite database file in the Firefox profile folder.

• http://kb.mozillazine.org/Bookmarks_history_and_toolbar_buttons_not_working_-_Firefox
• https://support.mozilla.org/kb/Bookmarks+not+saved#w_fix-the-bookmarks-file

Which security software (firewall, anti-virus) do you have?

There's nothing that I know of. I have HistoryKill 2010 but that runs every time I close the browser as well as at start up. Just closing the browser doesn't affect the bookmarks.

I updated everything it asked for on the first link. I had already tried everything on the 2nd link including deleting the sqlite file. I did notice there is a places.sqlite.corrupt file which happens to be the identical size as the file I deleted.

I am using ESET Smart Security as my antivirus software.

I also ran the scan several times to clean up the Places.sqlite file. The problem is the same...

You need to remove all places.* files and that includes places.sqlite-corrupted files and possible temporary shm and wal files.