Currently on OSX Selenium driver start opens up a new Firefox icon on OSX. Also, the current application loses focus and thus interrupts e.g. your typing.
Is it possible to make Selenium launch Firefox on OSX such way that it would not take focus or cause extra action in Dock?
The problem is due to the fact that Firefox does not always fire events correctly when it does not have focus. This will be fixed soon as it is now a normative part of the HTML5 spec.
I would recommend just having an extremely lightweight VM, in something like virtualbox or VMWare Fusion and just using Remote WebDriver.
Supressing Firefox icon in OSX Dock when running tests