I use Firefox browser in Ubuntu 10.10, but now it doesn't work. When I try to open the browser, an error message is displayed with the following content
Close Firefox Firefox is already running but is not responding. To open new window, you must first close the existing Firefox process, or restart your system.
Then I restart the system but again it doesn't work. Then I watch the task manager and I see that zombie is written in the same line as firefox like shown in the following image.