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Finally, Devboi has been updated for Firefox 1.5. If you aren’t familiar with it, its a sidebar extension that has full API docs for the following (from the homepage):

• HTML 4.01 elements, attributes, and entity tables
• CSS 2 properties, compatibility chart (IE 5 Mac, IE 5, IE 5.5, IE 6, Mozilla, Opera 5, Opera 6, Opera 7, Konqueror 2.2, Safari 1) and context links
• DOM 2 objects, methods and properties (Core, HTML, Events, Views, Traversal, Ranges and Stylesheets)
• XUL element reference and tutorials

Grab the offline version for the best all in one reference for disconnected development. There are also addon packs for Ruby, Rails, and PHP.