If your Firefox browser is crashing when you are using WordPress, this is the fix.
Firefox has Google Gears as an add on which interferes with WordPress. By disabling Gears you will fix the problem. This is how you do it.
If you are having trouble uploading images because of this error: File is empty. Please upload something more substantial. This error could also be caused by uploads being disabled in your php.ini when you use either the flash uploader or the browser, there is fix. A short article by Phillip Barron outlines a fix using the .htaccess file.