If the problem continues, you can manually reset the Software Update feature by closing your Mozilla application and deleting the "updates" folder and the two files "active-update.xml" and "updates.xml", which can be found in the folder where Mozilla stores temporary application data for your operating system.
For example, on Windows 7, the files "active-update.xml", "updates.xml", and the "updates" folder can be found in one of these locations  (using Firefox in the first example).
The Software Update feature allows you to automatically update your Mozilla application and installed add-ons (extensions and themes, but not plugins).When an update is found, follow the on-screen instructions to download and install the update.The application will need to restart to apply the update, but you can choose to restart later by pressing the Later button.Valid suffixes are: Description: Number of threads server caches for re-use.If this limit hasn't been reached, when a client disconnects, its threads are put into the cache, and re-used where possible. Normally this setting has little effect, as the other aspects of the thread implementation are more important, but increasing it can help servers with high volumes of connections per second so that most can use a cached, rather than a new, thread. Recently got it back from sager - had to be sent in for repairs because it was shutting down by itself by instantly turning off. Was all good for a couple weeks, but now we're having another problem. Took almost a full minute just to close the Event Log Window before I attempted to use cmd.However, it takes no less than 15 minutes to login (Welcome with the loading icon next to it for 15 mins), and it also takes about 10 minutes to load the desktop. Wasn't doing this before, and no idea why it is now. However, when I went to check them they weren't in the log.You can however specify underscores as dashes - they are interchangeable.Variables that take a numeric size can either be specified in full, or with a suffix for easier readability.If you see this dialog, end any Firefox processes (or reboot the computer) and restart Firefox.If the issue is still not resolved and you are using Windows Vista, try the following:  Another possible solution is to reset the Software Update feature by ending all Firefox processes and then removing "active-update.xml", "updates.xml" and the "updates" folder from the appropriate folder locations (see above).