Finally WebParts are getting Drag & Drop support for FireFox. You can see how to set it up at David Barkol blog:
However, if you look at the screenshot you’ll notice that the menu isn’t working properly in FireFox. Instead of the menu there’s an “u” character. When a WebPartZone has the property WebPartVerbRenderMode set to WebPartVerbRenderMode.Menu, you can access to the menu if you click on the glyph in the upper right corner of the WebPart. If you’re familiar with the HTML output of a WebPart you’ll know that the glyph is an “u” character of the font called “Marlett”, so there’s still something wrong with WebParts in FireFox preventing the verbs menu to show. Anyway they have told that it will be fixed in the next Atlas release.
It seems that Atlas is getting closer to a release as now it comes with a “Go Live” license. I don’t know how much time I’ll be able to keep myself away from learning how Atlas works…