So Firebird is quite cute. However, it's terribly slow (especially scrolling through pages is unbearable with this awful stuttering), I'm used to faster performance from Safari. But one thing is absolutely top-notch: the extensions (see link at the title). I loaded the Webdeveloper extension and the Checky extension there, the former provides a whole set of web developer tools (such as visual representation of document structure, quick source display, various validators, tools for images, forms, enable/disable various features, etc.). Checky is simply an extension that plugs a large collection of validators for various purposes into the document's popup menu - including auto-discovery of the corresponding parts (e.g., CSS or RSS feeds are automatically found and then validated on request). Great. Now just make the whole thing faster and then I'll be happy.