To address your first point (my other comment was focused on the second):

You do not need to search every time, this type of app can be saved to the home screen. You could think of it like a bookmark to a tab that will run chromeless in it's own process (so no access to cookies etc. in your main browser process). For all practical purposes it is a low-privileged "hosted" app like any other - has it's own icon, possible to terminate, sandboxed and so does not share data with other apps.

FirefoxOS has a feature that allows you search and browse a set of these apps provided by everything.me but it's also possible to do this directly from the built-in browser app.