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How do I change the user agent of my browser so the the site I am viewing thinks I am viewing from a phone or tablet?

Currently sites see me as a PC (correctly) and I am I unable to test the mobile parts of the site.

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migrated from stackoverflow.com Apr 13 '13 at 13:19

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User agent switcher for firefox and user agent switcher for chrome. These would be a good place to start. –  JohnP Mar 31 '13 at 13:52
Hmm - but is still not got right page from server - like mobil page - i have try them. Is work if you make web page like basic responsive - is css and JS crontrol - but still not same like mobil or table. I make a RESS - just Google like to say use RES and not SEO - cause is easyer for them to seek - but mobil page Work not great ( just same high data send ) –  Jesper Mar 31 '13 at 14:00
You can try see this page link andmag.se/ress to see what y browse like :-) –  Jesper Mar 31 '13 at 14:18
If you want to see exactly what a mobile device would see then you'll have to use a service like browserstack. You can only control the useragent and size of the browser. The rendering engine will have its own quirks. –  JohnP Mar 31 '13 at 18:11

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