Yes, sounds like we're wanna-be pals. I am the only person I know who has a "Web clip" bookmark on my iPhone for IMDB (and, to my surprise, it's not some slick custom iPhone icon) because I find myself going there just about every single day.

I've also been migrating from Apple's Safari browser to Firefox because Safari is becoming increasingly unstable for me and so I too have been eyeballing that search area on the top right corner of Firefox and wondering what you can do with it.

Fortunately, all is revealed by simply clicking on the tiny triangle icon and revealing the pop-up menu:

Choose Manage Search Engines... and you'll pop right to the proper preference window:

Choose the subtle little Get more search engines link and you'll promptly be directed to the Firefox add-ons: Search Engines page on the Firefox site. It has quite a list of different site search engines that are compatible with Firefox and have been scripted, including A9, BBC News, Marketwatch, ESPN, Expedia, Technorati and the Weather Channel.

More importantly, yes, it has IMDB:

Click on the name of the search engine (in this case "IMDB") and instantly a window will pop up:

Choose "Add" and, if you want, have it simultaneously change the default search engine to the new entry at the same time by checking "Start using it right away."

Now you have movie nerd nirvana, IMDB search accessible right on your address bar. Life is good.