Open firefox and paste this url chrome://browser/content/browser.xul in the address bar and go … Hurrayy
You can see a firefox instance inside the tab. This can be continued in a recursive manner.
This tweak can be used to group websites . ie we can open mail windows , blogs under the same tab .. how is the idea ..
Usually windows will take 30 to 2 mins to shutdown the system .. Here is a tip that will give us the power to shutdown immediate a windows system . “Just like switching off a bulb”
To do this , open the task mananger by pressing CTRL+ALT+DEL .
TaskManager
Then Click on the shutdown menu ..
after that click on the Turn Off Menu By Pressing Ctrl Button , then click ..
ShutDown Menu - Taskmanager
You can see that the system will turn off immediately… when u switch on the pc you will find that there is not scandisk , or any checks comming up .. .I am oing this .. and found no probs .. The same is applicable to the hibernate link in the shutdown menu …
The new face of application theming , personas . You can change the style what ever you like at any time . no need to restart the firefox. And the best news is “NO NEED To RESTART .. 
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You can get personas from here http://getpersonas.com
