At the top of the list of things for web developers to remember should be a reminder that whatever can go wrong, will go wrong. Only the simplest of web page designs can make it from authoring app to the real world without having to undergo a few tweaks caused by browser incompatibility, accessibility problems, server issues or coding mistakes. The main issues arise from the fact that pinning down problems in web pages really isn't as simple a task as you might hope. Web browsers are designed to be easy to use, so filling them up with complex debugging tools is not an ideal solution. Browser developers might not be interested in adding web-debugging tools to their software, but that doesn't mean no one else can. If a browser has a simple, open extension architecture, anyone can add new features to it and make it do more or less anything they want, The most extensible of all browsers is Firefox, which now has over 1,000 extensions. These are almost all cross-platform, so they work on Macs and tinux machines as well as Windows. They include debugging consoles, syntax validators, cookie manipulators, accessibility tools, manuals, measurement tools and search engine optimisation information. Add to that extensions that can rewrite the pages and stylesheets you're using and suddenly Firefox becomes by far the most developer-friendly of all the browsers available.
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