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

Firefox error “Couldn’t load XPCOM”

  • 5 replies
  • 12 have this problem
  • 2 views
  • Last reply by FredMcD

more options

Microsoft did an update and now can’t refresh Mozilla browser. Can’t get online with Mozilla. Keep getting error msg. Can’t remove Mozilla to reinstall. Any ideas?

Microsoft did an update and now can’t refresh Mozilla browser. Can’t get online with Mozilla. Keep getting error msg. Can’t remove Mozilla to reinstall. Any ideas?

Chosen solution

I am glad to hear that your problem has been resolved. If you haven't already, please select the answer that solves the problem. This will help other users with similar problems find the solution more easily.

Thank you for contacting Mozilla Support.

Read this answer in context 👍 0

All Replies (5)

more options

Let’s do a full clean re-install;

Download Firefox For All languages And Systems {web link}

Save the file. Then Close Firefox.

Using your file browser, open the Programs Folder on your computer.

Windows: C:\Program Files C:\Program Files (x86)

Mac: Open the "Applications" folder. https://support.mozilla.org/en-US/kb/how-download-and-install-firefox-mac

Linux: Check your user manual. If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it. See Install Firefox on Linux; https://support.mozilla.org/en-US/kb/install-firefox-linux

If you downloaded and installed the binary package from the Firefox download page, simply remove the folder Firefox in your home directory. http://www.mozilla.org/firefox#desktop ++++++++++++++++++++++++++++ Look for, and remove any Mozilla or Firefox program folders. Do not remove the Mozilla Thunderbird folder if there is one.

Do Not remove the profiles folder.

After rebooting the computer, run a registry scanner if you have one. Then run the installer. +++++++++++++++++++++++++++ If there is a problem, start your Computer in safe mode and try again.

http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode This shows how to Start all Computers in Safe Mode; Free Online Encyclopedia

more options

Will not download. Tried to download on chrome store and won’t download from there either

more options

Alp60 said

Will not download. Tried to download on chrome store and won’t download from there either

REFRESH INSTRUCTIONS

Please Refresh but do this 1st: Delete your Cookies and Cache and TEST.

then

TEST....... If no issues then Extensions which need to be added back in 1 at a time and tested ..... Or it is your Profile : Make a new one and test ...:

If is your Profile :

Note: Any customization will revert back to default, you will also need to reinstall Extensions.

more options

I downloaded chrome again and then was able to download Firefox and is now working properly. Thanks for your suggestions and help

more options

Chosen Solution

I am glad to hear that your problem has been resolved. If you haven't already, please select the answer that solves the problem. This will help other users with similar problems find the solution more easily.

Thank you for contacting Mozilla Support.