Hi. I'm very happy that the HTML5 History API now allows me to change the address bar (before # char) without doing a roundtrip to the server (and thus flicker the user's screen).. I've implemented this on my new site, test url at http://skatescene.biz/elections (on an ADSL line, bit slow). In order for search engines to spider my content, I'm sending from PHP all internal links as <a href="/path/to/content">, then using javascript on window.load to transform/ajaxify them to href="javascript:window.History.pushState(null, 'pageTitle', '/path/to/content'); Chrome has no problems with this at all, and Firefox has no problems if those transformed URLs are eval()-ed (which my opensource animated button and menu components do). However, a completely normal <A HREF=""> in my content, for instance the link to "democratic party" in the content of http://skatescene.biz/elections, will in FireFox (latest version) give me a blank page with "true" on it, and in the address bar the transformed link (javascript:window.History....) I have been unable to find a work-around for this firefox bug. Or maybe i'm doing something wrong. If you have any tips for me, please let me know. P.S. the CODE for that site is opensourced, as thanks for the many opensource tools I use myself.. It even includes HTML+JSON caching of many pages of content for lightning fast browsing within the site :) See http://mediabeez.ws/blog/html5-history-plus-caching