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GTmetrix - GTmetrix is a free tool that analyzes your page's speed performance. Using PageSpeed and YSlow, GTmetrix generates scores for your pages and offers actionable recommendations on how to fix them.
Firefox Developer Tools - Examine, edit, and debug HTML, CSS, and JavaScript on the desktop and on mobile.
PageSpeed Insights - PageSpeed is addon for ...
Google Chrome Developer Tools - Get started with Google Chrome's built-in web developer tools.
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Code Cola - Code Cola is a chrome extension to editor online pages' style visibility.