Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Yesterday, Firefox downloaded a new version. After startup this morning I got the message "couldn't load XPCOM." Firefox will not load.

  • 4 प्रत्युत्तर
  • 2
  • 2 views
  • के द्वारा अंतिम प्रतियुतर cor-el

more options

Yesterday Firefox downloaded an updated version. While my computer was installing it this morning I got the message: couldn't load XPCOM. I use Windows 7 home version.

All Replies (4)

more options

hi, does it help if you download the full installer from https://www.mozilla.org/en-US/firefox/all/ and run the setup again?

more options

Will I lose my bookmarks when I reinstall Firefox or is there a way to save the bookmarks?

more options

The settings are not in the Firefox program folder but in a separate place. You can backup your Profiles just in case though.

https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data

more options

An error message about XPCOM missing or about platform version usually happens because of a failed Firefox update that left you with a mixture of old and updated files in the Firefox program folder. This can happen in case security software was keeping a handle of some of the files in the Firefox program folder preventing Firefox from replacing all the files. You can do a clean reinstall to ensure that all files are replaced. You may have to disable security software temporarily in case the problem persists.