If you install the new Safari 3.1, my MiddleClickClose extension stops working. The first time you launch Safari, SIMBL complains that the plugin hasn’t been tested with this version of Safari, but that’s easily fixed by putting the proper version 5525.13 in Info.plist for the tag MaxBundleVersion. Once that’s done, the extension loads, but doesn’t seem to do anything. The problem is that the system is no longer delivering a mouseUp event when you middle-click a tab. I’m not sure what’s going on, but I will look into it. I’ve become dependent on my middle-clicks…