After installing Firebug so I can use it create my website easily, I realized that when I open my gmail, it just taking forever to load the page or will lead to a page asking me to view gmail in normal html format. Today, at work, I happened to see a big error message in my gmail.
By following the instruction from google, I disable the firebug just for gmail. But everytime after I log out and close my gmail tab, my firefox browser just crashed.