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Website that don't support Firefox

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Is there such a thing as websites that don't support Firefox? T-Mobile just told me they don't. This is the first time in 10 years of using Firefox that I can recall a site categorically not supporting Firefox - or at least, a major global corporation, and *telecommunications corporation* at that.

Also T-Mobile tech support said they do support some other browser that is not IE. Safari, Chrome or Opera. It's so obscure the tech person didn't know the name of it and had never heard of anyone in the US using it.

Is there such a thing as websites that don't support Firefox? T-Mobile just told me they don't. This is the first time in 10 years of using Firefox that I can recall a site categorically not supporting Firefox - or at least, a major global corporation, and *telecommunications corporation* at that. Also T-Mobile tech support said they do support some other browser that is not IE. Safari, Chrome or Opera. It's so obscure the tech person didn't know the name of it and had never heard of anyone in the US using it.

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Basically yes. Websites should support the established web standards, not specific browsers or specific rendering engines.

http://www.w3.org/