“Prism is an application that lets users split web applications out of their browser and run them directly on their desktop.” I’ve been waiting for something like Prism for a while, a means to pull out some of the long run tabs I use for webapps. It is often a PITA when your browse hangs because of some flaky site and you can’t access your other tabs. Prism still seems to use one thread: XULrunner. So it might not be a complete solution if you have several webapps and one causes problems for the others.
Plus flash doesn’t seem to be working at the moment. This might or might not be a good thing. Flash is one of the main causes of memory issues in Firefox. I have a couple sites using flash, the FX Oanda tracker for example, that I would like to split out of main Firefox browser.
Prism seems to handle http links intelligently. I’m guessing that links to external sites a passed-thru. At least with both Gmail and GReader it works as you would expect.