We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

Avatar for Username

Zoeken in Support

Vermijd ondersteuningsscams. We zullen u nooit vragen een telefoonnummer te bellen, er een sms naar te sturen of persoonlijke gegevens te delen. Meld verdachte activiteit met de optie ‘Misbruik melden’.

Meer info

Deze conversatie is gearchiveerd. Stel een nieuwe vraag als u hulp nodig hebt.

Getting error message when Firefox starts

  • 1 antwoord
  • 4 hebben dit probleem
  • 1 weergave
  • Laatste antwoord van cor-el

creativetouch
creativetouch
more options

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?

Alle antwoorden (1)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

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).

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)