Since there was some interest from people about the new features in Minefield 2007082404 (a trunk build that will eventually become Firefox 3), I thought I’d post a couple of screenshots with the new features.
The above image is the new download manager. As you can see, it now uses sections to differentiate active and completed downloads, and adds a search box which shows results as you type. It’s in its early stages at the moment, so although it works functionally I’m sure the actual interface will be redesigned by the time Firefox 3 is released proper (which should be later this year or early next year).
And this is the new plugins manager, which is extra tab on the Add-ons dialog. It essentially replaces the rather confusing about:plugins window, but also lets you disable plugins (although doing so requires a restart of the browser). I imagine that over time plugins will be allowed to have icons to make them more easily recognisable and may even have links to configure them (such as a link to the QuickTime preference pane for QuickTime) but this is pure speculation.
If there are any other aspects of the Firefox nightlies that you want to see, let me know in the comments.