You are saying Firefox opens full size, but when you what the smaller window, you can't change it's size? Do you have any other problems with Windows or Firefox? ----------------- Start '''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Firefox in Safe Mode]''' {web Link} by holding down the '''<Shift><br> ''(Mac Options)'' ''' key, and then starting Firefox. Is the problem still there?