Supressing warnings when building Firefox native components on Windows.
Disabling builds for newly created Firefox C++ projects on unsupported platforms
Allow extraction of IEDriverServer components to custom directory in .NET

The .NET bindings were passing an incorrect command-line switch to
IEDriverServer.exe for the location to extract embedded library files. Fixes issue #5211.
Making .NET alerts tests more robust
Hacking around the case where McAfee SiteAdvisor is installed as a plugin for IE.

Modal dialogs are now checked for existence of the WS_CAPTION style. Note that if IE ever decides to change how it displays alerts, this may begin to cause failures in alert detection. Fixes issue #4839.