W3DNA

Related

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  W3C Markup Validation Service

  This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc.

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  Sheets2JSON - Convert Google Sheets

  Convert public Google Sheets into clean JSON or CSV. Sheet2JSON is a lightweight extractor that reads Google Sheets and outputs structured data formats that are ready to use in websites, apps, and scripts.

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  EnvSwitcher

  Stay safe and switch seamlessly between development environments.

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  PerfectPixel by WellDoneCode

  This extension helps develop your websites with pixel perfect accuracy!

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  Web Developer

  Adds a toolbar button with various web developer tools. The official port of the Web Developer extension for Firefox.

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