Interesting question - at a guess, I'd say that you would need to override the 
user agent header to impersonate eg mobile safari.

I haven't tried it, but this gem looks like it might do kind of what you want?

http://watirmelon.com/2012/03/27/introducing-webdriver-user-agent-gem-a-quick-way-to-run-ruby-webdriver-tests-emulating-mobile-devices/


On 31/10/2012, at 7:11 PM, jamesl <[email protected]> wrote:

> Hi All,
> 
> I'm needing to test responsive layouts and functionality and I'm hoping to use
> firefox and the usual capybara / selenium setup.
> 
> How can I trick the browser into thinking it is a mobile size device?
> Obviously or not so obviously changing screen size isn't enough
> as I want Twitter Bootstrap to also think it is running on a mobile.
> 
> - James.
> 
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