An anonymous reader writes "Mozilla quietly posted the first beta build of its Firefox 4 browser early this morning. The 'Chromified' browser leaves a solid first impression with a few minor hiccups, but no surprises. If you have been using a previous version of Firefox 3.7, which now officially becomes Firefox 4.0, you should already feel comfortable with this new version. Mozilla has not posted detailed release notes yet, but there seem to be no major changes from Firefox 3.7a6-pre, with the exception that the browser is running more smoothly and with fewer crashes." Update: 06/29 18:40 GMT by S : Mozilla's Asa Dotzler writes, "Mozilla has not shipped Firefox 4 beta yet. We are in the process of making and testing the final set of changes, but we're not quite there yet." Changed headline to reflect this.