Trouble: This problem is regarding a frequent error I face these days in my computer after I upgraded to firefox 3.5. Every time when I close firefox by closing all its windows and the next time I try to start firefox the following error message box appears If you can’t read the error message, here is the error message Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system. This message may appear due to following known reasons like Trouble Cause #1 – Firefox Profile Lock Not Released The first foremost reason behind this error is when firefox is not closed down properly due to which firefox profile lock may not get released Fix: Fix Cause #1: In this case firefox creates a lock on the profile getting used in firefox, but sometimes due to improper shutdown of firefox application the lock may not get released which cause the above error message to appear. In that case you will need to delete the...