Browser detection, Messenger, and controls

Four points:

1. You're currently looking for the string 'Firefox' in the user agent, rather than 'Gecko', which might be a better idea - I use a non-Firefox browser, SeaMonkey, which is nevertheless still based on Gecko and so works fine with Klorofil/Purefect.

2. Messenger/FlazTalk doesn't act like a normal application - it doesn't appear on the bottom bar, requiring use of the Start Menu to make it appear again if minimised, and it cannot be closed.

3. The drop-down box widget behaves unusually compared to those on Windows, at least - I'm not sure about other OSes. Usually if the drop-down list is open and you click the drop-down arrow button, it closes the list, but in Klorofil it seems to close and immediately re-open the list.

4. The tooltip for the middle button is normally 'Maximise', but after maximising, it should probably become 'Restore'; however, it stays as 'Maximise'.

And a bonus one:

5. It would probably be a good idea for the Memory Game to preload images for slower connections ;)