Firefox is already running but is not responding" error message - How to fix it

Generally some times you will get the message " Firefox is already running". When you get this message you need to resolve this problem . Here i am going to explain the process to fix it.
Please follow the steps below.

1. Open the Taskmanager in your system by pressing the keys Ctrl+Alt+Del
2. This screen will appear on your screen.
3. Click on the Process Tab
4. In the list of process tab select Firefox.exe
5. Click on the End Process , 
6. Clilck "Yes" on Task Manger Warning Alert"
7. Close the Task manager
8. Now open Firefox. It will work..happy Browsing.