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Encoding autodetection chooses ISO-8859-5 instead of UTF-8

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A certain site producing HTML in UTF-8 without meta tags. The Firefox detects the encoding as ISO-8859-5, an absolutely dead and useless 'standard'. How to exclude it from the autodetection and maki it proper unicode?

A certain site producing HTML in UTF-8 without meta tags. The Firefox detects the encoding as ISO-8859-5, an absolutely dead and useless 'standard'. How to exclude it from the autodetection and maki it proper unicode?

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It's a strange guess, if it's a guess. Are you sure the server isn't sending a header specifying that encoding? To view the content-type header, you can use an add-on (or if it's not a secure page, an external proxy):