Conveniently, <a href="https://addons.mozilla.org/en-US/firefox/addon/5917/">Firefox Throttle</a> meets my needs exactly and allows exclusions for specific websites or specific IP Addresses.
The easiest method of checking whether Skype is installed is actually to check for a Registry Key. We, of course, can’t check…
How do you test browsers? I don't usually try for perfect pixel positioning in every browser, but if the client asks I won't complain!
Always make sure that you modify the session.save_path to somewhere meaningful and ensure the directory has the correct file permissions.