Now I am getting this error message when I open Firefox "what happened:TypeError: Components.classes['@mozilla.org/extensions/manager;1'] is undefined" Then when I click on okay Firefox opens. How do I get rid of that error message?
I try to open Firefox and I get this error message "what happened:TypeError: Components.classes['@mozilla.org/extensions/manager;1'] is undefined" then when I click on ok the browser opens. I have tried reinstalling Firefox but that does not take care of the problem. What can I do? What is wrong?
All Replies (5)
Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
- Don't make any changes on the Safe mode start window.
- https://support.mozilla.com/kb/Safe+Mode
Thank you so much. Following your advice found out it was an add-on from a new program I had installed. I disabled the add-on and now it works fine. Really appreciate your answer and Firefox, my favorite when it comes to the internet.
You're welcome
Can you tell us which Add-on caused the problem?
It helps others with the same or a similar problem who read this thread.
It was from this site: http://www.tracker-software.com/ A tracker add-on comes down with their PDF viewer. I don't even know what it does. I disabled it then I removed it. Now Firefox works fine.