Firefox add-on to make IMDB usable again!

I can’t seem to get it to install. I click Install on the website, then click Install on the Greasemonkey pop-up, and then nothing happens. It doesn’t show up in the “Manage User Scripts” window in Greasemonkey. I can install other Greasemonkey scripts, though.

ETA: This is in Firefox.

Try putting it in the directory: ~/Library/Safari/Extensions

No such folder.