I had the same problem. I solved it by shortening some very long names of the bookmarks in the parent folder (the one containing the folder that was not expanding). Try it and let me know.

Yeah, I just recently discovered that myself. Thanks a lot for getting back to me!

hi - how would i easily find the bookmark with the very long name... so stopping my pop-up bookmark menu to open "expanded"

i have 100s of bookmarks.

thankyou

Maybe save (export) the bookmarks to an HTML file and open that file in a Firefox tab.

• http://kb.mozillazine.org/Backing_up_and_restoring_bookmarks_-_Firefox

thankyou again cor-el nice thinking outside box!

I renamed the longest bookmark... restarted firefox that did not resolve

maybe i have more than 1 "long" bookmark name

what is the length of "long" in FF world? thankyou

Here is a bookmarklet to tag names longer than a maximum length that you can use on the HTML file opened in a tab.
You need to create a bookmark with the location set to the JavaScript code or run the code in the Scratchpad.

javascript:(function(){var e=document.getElementsByTagName('A'),E,M=50,i;M=prompt('Maximum Length?',M);for(i=0;E=e[i];i++){N=E.innerHTML;if(N.length>M){E.innerHTML='[!'+N.length+'!]'+N;E.style.color='red';E.style.fontWeight='bold';}}})();