Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, the DOM, JavaScript, network activity and cookies live in any web page.
Opera Dragonfly is a fully featured development and debugging tool integrated into the Opera browser. Develop for desktop, mobile, tablet, or TV? Opera Dragonfly has it covered. Remote debugging allows you to connect to the Opera browser on your device and to start debugging from your PC or Mac. All
... [More] the features are available, so you don’t need to compromise. [Less]
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