OS X :: How To Launch Applescript From Firefox URL Bar

I often have a small chat program running, I keep it in the bottom right corner of my screen. It's kind of a stupid application, so it never pops up above active windows for an update, so I keep it uncovered - this means all my windows have to be shrunk to fit, and to not hide it.

Now, because I'm such an OCD person, I like to have a perfect, 1px border between applications, and I like things to be neat and orderly, etc. That means there's a VERY specific place all my firefox windows go. When i open a new one, however, they can be in any shape, size, etc. For a while, I had a bookmarklet with a keyword, I would just type "chatsize" into the URL bar, and the window would automatically position itself correctly. The problem with this is the fact that it, for some reason, would ignore the 4 leftmost pixels of the entire screen, and would not line up with the edge. Moving it 4 pixels isn't such a big deal, but it gets kind of annoying. No matter what I tried javascripting into the URL bar, it never worked.

I came up with a solution: Applescript, I could make the window go to the perfect spot and be the perfect size, but now, I have another problem: I can't launch the applescript from the URL bar. I want to be able to type in "chatsize" to the URL bar, and have it work perfectly, but whenever I change the bookmark to the applescript's location on my hard drive, it attempts to download it. Does anybody have any clue how to launch the application from the URL bar?