i have been using firefox as default browser for a long while.suddenly i am confrinted with "class not registered" when I try an open a link from my email.I am usung version 20.0.1
I have followed the instructions on your site to no avail. i have delted mozilla from program file etc and reinstalled with no good result. Effectively i am now not able to use Firefox anymore as my default browser..
surely, there must e a solution to this problem
Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
Do NOT click the Reset button on the Safe Mode start window or otherwise make changes.