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Firefox Developer Tools - Examine, edit, and debug HTML, CSS, and JavaScript on the desktop and on mobile.
Surge for Mac - Advanced Web Debugging Proxy for Mac & iOS
Google Chrome Developer Tools - Get started with Google Chrome's built-in web developer tools.
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
Code Cola - Code Cola is a chrome extension to editor online pages' style visibility.
HTTP Headers - HTTP Headers allows you to quickly see the HTTP header information for the current URL.