Even if there's no way to blast all Firefox users, there are blue links to standard Mozilla-hosted "help" web pages within the Firefox add-ons config, links tha

Even if there's no way to blast all Firefox users, there are blue links to standard Mozilla-hosted "help" web pages within the Firefox add-ons config, links that a non-insignificant number of confused users will probably click. Those web pages could easily be updated with info about the cert expiry snafu.