I'm developing a webInterface so I installed Opera and Chrome on my KUbuntu 16.04. System (additionally to Firefox which I usually use)
BUT ... It seems that after installing Chrome some services use Chrome es default browser though Firefox IS my default browser!
e.g. If I click on a URL in Thunderbird -> opens in Chrome If I click directly on phpmyadmin from the KStarter -> opens in Chrome
Before installing Chrome everything just opened in Firefox
Any idea how to make Firefox REALLY default browser again?