A web browser with too many open tabs can make the screen look clumsy and annoy the user easily. It becomes difficult to identify a particular tab, thereby making it tedious to switch between tabs!
Well, Firefox users have a workaround for this.
Believe or not, it is possible to open Firefox inside Firefox. You can now use a tree like structure for tabs.
Here is Trick to Open Firefox Windows within Firefox Tab
1) Start you firefox browser (This is a 1st instance of Firefox)
2) Now type below URL in your Address bar
3) Hit Enter Key, Viola!!! Instantly you will get another Firefox window within Firefox Tab
Newly Opened Firefox Window within Firefox tab will behave just like another Firefox instance and you can open another Firefox windows within this Firefox tab.