For those of you who are not familiar with Mozilla Prism, it's a tool that allows you to sandbox web applications away from the rest of your day-to-day browsing. For security freaks (which we should all be to at least some degree), this is an excellent tool, as it prevents data from being shared or potentially stolen between web pages. It also allows you to clear away the browser navigational elements, making the page more like a real application and giving you more screen real estate to work with.
In theory, there's a plugin/template linked to at mozilla's prism wiki that is supposed to fix this problem, but it doesn't seem to work as of Prism 1.0 beta 1. A user named rotassator on the Mozilla Lab's forums outlined an excellent alternative solution that I'd like to repeat here for searchers' sake. Here's how to do it:
I hope this helps someone!