Ever want to test a Chrome Web Store app without installing it? You may get your chance if a new Chromium feature find its way into Google's commercial browser. Mountain View is experimenting with support for "ephemeral" apps that launch like regular Web Store titles, but don't leave a footprint in Chrome or Chrome OS. Users wouldn't even have to visit the Web Store in the first place -- a recent Chromium build lets surfers launch an app directly from a Google search result page. There's no certainty that the new try before you buy (or at least, try before you glorified bookmark) capability will actually land in Chrome's stable channel, but it certainly wouldn't surprise us.