Next to my job I love cooking, going to the cinema, reading books, listening music, drinking wine, ...
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SenSEO is an extension checking the most important on-page-SEO-criteria and calculating a grade of how good your site fulfills these criteria.
Checks your document for semantic elements and highlights them.
WatchPug is an extension checking your website documents for validation errors. Find more information at http://watchpug.com/.