Firefox Developer Tools is described as 'Examine, edit, and debug HTML, CSS, and JavaScript on the desktop and on mobile' and is a Web Debugger in the development category. There are more than 10 alternatives to Firefox Developer Tools for a variety of platforms, including Windows, Linux, Mac, Web-based and Mozilla Firefox apps. The best Firefox Developer Tools alternative is Google Chrome Developer Tools, which is both free and Open Source. Other great apps like Firefox Developer Tools are Web Developer, HTTP Debugger, Plunker and DOMScope.
TinyJSD is a JavaScript debugger for privileged code running Mozilla products like Firefox, Thunderbird, SeaMonkey. It serves to debug the application as well as extensions written in JavsScript.
Code Cola is a chrome extension to editor online pages' style visibility. It helps visual designer, interactive designer, web site operator and other peoples modify the online pages quickly and easily.
Slowy is an OSX app which simulates custom connection's conditions and limits the network traffic. It is created for web developers that work on a local server, to test a website with a real-world connection.
Omnibug is a plugin for the Google Chrome and Mozilla Firefox browsers to ease developing and debugging web metrics implementations. Each outgoing request (sent by the browser) is checked for a pattern; if a match occurs, the URL is displayed and decoded to show the details of...
Test HTML / JavaScript / CSS snippets with real-time preview. You could also add libraries (jQuery, YUI etc.).
Uthrottle is a tool which simulates custom connection’s conditions and limits the network traffic to a specified speed on network interfaces. In complex service oriented application stacks, some bugs only manifest themselves on congested or slow
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