Getting error message when Firefox starts
I am getting the following message when I start Firefox ever since I upgraded to the newest version (4.0.1). This is what it says:
what happened: TypeError: Components.classes[@mozilla.org/extensions/manager;1’] is undefined
Firefox doesn’t load until I click the OK button in the message. What is causing this?
I am getting the following message when I start Firefox ever since I upgraded to the newest version (4.0.1). This is what it says:
what happened: TypeError: Components.classes[@mozilla.org/extensions/manager;1’] is undefined
Firefox doesn’t load until I click the OK button in the message. What is causing this?
All Replies (1)
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
If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
- Use "Disable all add-ons" on the Safe mode start window to disable all extensions.
- Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")
In Firefox 4 you can use one of these to start in Safe mode:
- Help > Restart with Add-ons Disabled
- Hold down the Shift key while double clicking the Firefox desktop shortcut (Windows)