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Is there an offline HTML validator for Firefox 10+ working on Mac OS X?

share|improve this question does not work in your firefox? – akira Apr 3 '12 at 6:26
I need an extension, addon – dllhell Apr 3 '12 at 6:37
can't find that information in the question ... related question:… – akira Apr 3 '12 at 6:38
thank you, I dont know how I missed this question... – dllhell Apr 3 '12 at 6:53
so you need one which operates 'offline'? you should specify that in your question. – akira Apr 3 '12 at 8:38

Does ist have to be a Firefox extension? Because Mac OS X includes W3Cs validator in already.

% pkgutil --file-info /usr/bin/tidy
volume: /
path: /usr/bin/tidy

install-time: 1312458669
uid: 0
gid: 0
mode: 755

Open a shell and type man tidy and you are good to go. Dave Raggett wrote a nice introduction for the tidy utility if you want to know more...

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Here is an option:

Not a Firefox extension itself but you can use it with the Firefox Web Developer Extension.

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