Gorgeous brown tabby. I doubt she is a pure-bred, these are fairly rare in cats, especially if strays, rehomes or shelter animals. This doesn't mean they are any less unique, friendly and gorgeous. Mix-breed cats are known as Moggies. All of my cats are mixes, even one that looked like a Siamese.
Here's a link to the site's FAQ and it'll help you navigate the site and also posting of pictures can be found right at the bottom of the FAQ under Image and Video Tutorial
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Please post photos of your cat/cats after you've read to to do it. Enjoy your stay