Gmail vs. HMTL Validator in Firefox

I’ve been having problems this past week with Firefox freezing up when I’m using Gmail. Fortunately I found the cure today: If you’re using the HTML Validator extension (and if you’re not, you should be!) right-click on its icon in the status bar, select “Disable for mail.google.com.” on the pop-up window, modify the address to say just “mail.google.com,” click on the “Block” button, and it should populate the large listarea  beneath it. Click “Close” and you’re done! (Solution found at Gmail Help Discussion group.)