Since I removed rekonq from my system, numerous apps which launch links, e.g. Stackapplet and Thunderbird are not correctly launching links with Firefox, which I am using now as my primary browser.I need a global way of telling Kubuntu to automatically launch links inside apps with Firefox,   I have tried changing file associations but that appears to be irrelevant. System Kubuntu 11.10 64-bit@rozcietrzewiacz - your suggested solution can be found here:
Broken link/launch behaviour on Kubuntu 11.10 desktop after rekonq uninstalled
desktop environment