All drop down lists in Firefox, whether it's the menu drop downs, the autocomplete drop downs in the URL bar or the Search field, or even autocomplete drop downs in website form fields, flicker on and off as I type, or when I'm right clicking a link to open in new window or trying to copy a link. I can sometimes get what I want by waiting for it to flicker on and clicking at just the right moment, but it often doesn't work at all. I have a fresh install of Firefox 13.0.1 with no running add ins, plugins or other 3rd party tools. (The troubleshooting info says I have the Adobe Create PDF Extension enabled, but it's not) None of the suggested fixes I've found in the forums seem to apply here, cause they're all related to add-ins that I don't have. Any other ideas? Thanks