W3C Markup Validation Service

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  Edit with Paint.Net

  Adds a context menu item to send image links directly to Paint.Net photo editor

  评分： 总评分次数： 4

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  Youtube converter button - YTLoad

  YouTube downloader FREE - Convert videos to MP3 MP4

  评分： 总评分次数： 14

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  PageSpeed Insights

  This will take the URL of the current tab and send it to PageSpeed Insights for a web performance analysis.

  评分： 总评分次数： 3

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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.

  评分： 总评分次数： 0

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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.

  评分： 总评分次数： 114