FYI Many of my clients have been having issues with Firefox v14 failing to load. I have found that this is due to Prevx Safeonline. To fix, close Firefox, load Prevx, disable Safeonline. Start Firefox, it will go into Safe mode. Close Firefox, wait half a minute for the Firefox process to close, then start Firefox again. All should now be fine.
Thank you for the report and work around. We're looking into this now and will keep you updated as we make progress.