I announced here that I had updated MiddleClickClose to work with Safari 3.1, but that it had problems loading under Safari 3.0. Actually, the problem was that it wouldn’t load on a PPC chip; I was testing on my iBook G4, but I hadn’t generated a universal binary. That was caused by having the iPhone SDK installed. Anyway, I dropped back to Xcode 3.0 and got a universal binary built, and now everything is happy.
If you want the plugin, ensure you have SIMBL installed, download the binary package below, and unzip it in ~/Library/Application Support/SIMBL/Plugins and restart Safari.
- Binary — MiddleClickClose.zip
- Source — MiddleClickClose-Src.zip
As usual, it’s distributed under the GPL.
Joey Gibson's Blog 
Joey, your plugin is more than neccessary. This should have been a default feature in Safari. Now that I’ve upgraded to 3.1.1 it’s stopped working.
-Hoping for an update in the near future.
Matt
D’oh! I haven’t gotten around to installing the latest Safari patch. I’ll try to do that shortly and figure out why it’s not working.
Did you upgraded from Safari 2.0 or 3.0 straight to 3.1.1, without hitting 3.0? That’s the only thing I can think of that would have broken it for you. I just installed 3.1.1 and it worked fine for me.
However, I have updated the Info.plist file to have the current Safari’s version, so go here https://joeygibson.com/blog/tech/mac/middleclickclose_for_safari_3_1_1.html and try installing that one.
Howdy. Love your plugin but it seems to have broke with Safari 4 (Developer Preview).
Any chance for an update? 🙂