https://chrome.google.com/webstore/detail/bnbbfjbeaefgipfjpdabmpadaacmafkj
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Firebug Lite easily integrated into Chrome. Even if I am not a fan of Chrome, because of the omnipotence of Google, I find this tool very useful as a debug facility.
Charles is an HTTP proxy / HTTP monitor / Reverse Proxy that enables a developer to view all of the HTTP and SSL / HTTPS traffic between their machine and the Internet. This includes requests, responses and the HTTP headers (which contain the cookies and caching information).
Seems to be little more usable than wireshark!
"Jet Profiler for MySQL is real-time query performance and diagnostics tool for the MySQL database server". I love the Query ratings feature and the live query observation - should replace the weak use of MySQL proxy.
Safari's inspector has been redesigned a few months ago, but I didn't notice this. It looks pretty and rather efficient, I am gonna give it a try on our next project.
https://symfony.com/legacy/wiki/sfFirePHPPlugin
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FirePHP enables you to print to your Firebug Console using a simple PHP function call. What makes FirePHP different? All data is sent via a set of X-FirePHP-Data response headers. This means that the debugging data will not interfere with the content on your page. Thus FirePHP is ideally suited for AJAX development.
https://www.opera.com/products/dragonfly
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Welcome to Opera Dragonfly alpha, the foundations of Opera's upcoming Developer Tools. Debug JavaScript, inspect CSS and the DOM, and view any errors – Opera Dragonfly makes developing using Opera easier than ever, both on your computer and mobile phone.
YSlow analyzes any web page and generates a grade for each rule and an overall grade. If a page can be improved, YSlow lists the specific changes to be made.
