Why does Firefox try to launch Adobe and/or Quicktime when I close Firefox? What is it loading into those programs?

When I shut down Firefox, it tries to start Either Adobe Reader, Quicktime, or both. It has done this ever since the first time I installed an used version 4. The applications do not actually launch, as in a window opening, but they are then present as a process in the system, and I have to close them from the Task Manager. It usually launches just one, but, if it's trying to launch one, and I use Task Manager to close it, it then launches the other. If I hurry and stop that one, Firefox reports that it messed up, and wants me to keep using the Internet for its own purposes that have nothing to do with what I was using the Internet for. This never happened under previous versions of Firefox. Do I need to revert to a previous version? I'm running Kaspersky Internet Security, and it shows I have no malware or the like on my computer, which could cause this. So, why is Firefox trying to do things I did not ask it to, and then expecting me to let it phone home to tell about it when I stop it. By the way, out of good practice, I often close down my Internet connection before closing Firefox, (in case I do get something like a Key Logger loaded, to prevent it from sending its final report before the cache is cleared), but this also happens when I have not yet closed my Internet connection before closing Firefox, so I do not think that is the issue, nor should it be. Your question below about when it happens does not provide for the answer "Every time Firefox Closes", so I picked the closest such answer.

This can be caused by clearing the cookies via [[Clear Recent History]].<br />
* Firefox/Tools > Options > Privacy > Firefox will: "Use custom settings for history" > [X] Clear history when Firefox closes > Settings
You can try to exclude the cookies to test that.<br />
You can let all cookies expire when you close Firefox to remove unwanted cookies and keep the ones with an allow exception.
* Tools > Options > Privacy > Cookies: "Keep until": "I close Firefox"
If you use [[Clear Recent History]] to clear the cookies when you close Firefox then Firefox also tries to clear the cookies from plugins like Flash and starts a plugin-container process for each plugin and possibly for each cookie (?) and that can add extra time if there are a lot of cookies to remove and also can cause an unresponsive script error to appear.

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