"Manage Bookmarks" [I left the misspelling in the subject line because I'm trying to clue into the conversation when I asked this question before on June 17th] no longer functions smoothly if left open longer than a minute. I will add a bookmark to a folder the first time, but then will no appear to repeat the effort with adding another to the same or another folder. Re 'jscher2000's answer to my question, switching to another folder and back offers no relief from this but you are correct in that the issue is the page does not refresh to show added content after the first (or maybe second) time, if left idle a few moments. Closing out and reopening 'Mange Bookmarks' and navigating to the appropriate folder (or subfolder) then becomes necessary for it to display that in fact it had added the bookmark. Tiresome. Is there any way to increase the amount of memory allotted by my computer or Mozilla to this function, to regain the functionality I once took for granted?

Re 'cor-el' , where is the 'places database'? Re how many, hundreds? See 2 screen shots; alphabetical, partial list of single entry under 'e' 'Evironment'; maybe a thousand. I have not tried restarting firefox in troubleshoot mode (latley), but I think I already tried that some time ago and it did not help.