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Firefox Freezing or Crashing on Windows.

Your connection is not secure in Firefox.

Mozilla Firefox keeps slowing down on Windows.

Then again – simply installing the latest Firefox version over your existing installation can also help. Restart your Windows computer and fresh-install Firefox, after downloading it from its official website.

Use a safe registry cleaner like freeware CCleaner to clear PC junk and to clean the Windows Registry of residual Firefox entries.

C:\Users\username\AppData\Local\VirtualStore\Program Files\Mozilla Firefox.

C:\Users\username\AppData\Local\Mozilla\updates.

C:\Users\username\AppData\Local\Mozilla\Firefox.

The may be hidden folders and you may have to unhide them via Folder Option: Delete C:\Program files\Mozilla Firefox or C:\Program Files (x86)\Mozilla Firefox, as your case may be.Īlso delete the following folders if you see them on your computer. Hence I said – back them up first.Ĭheck the Program Files folder. Remember that when you do this, all profile folders will be removed and you will lose personal data like bookmarks and passwords. Select the Remove my Firefox personal data and customizations option.

If nothing helps, you may have to fresh-install Firefox.īack up your bookmarks and saved passwords to a safe location. 2] Create a new Firefox profileĬreate a new Firefox profile and see if that makes the problem go away. If this solves your issue, you may need to disable some problem-causing addon. Open Firefox Menu, click the “?” Help button and select Restart with addons disabled. In fact I too received this message a few days back after I had the system restore my computer a couple of times to fix some other issues. This Firefox start-up error can typically occur after performing a Windows System Restore or if you run it in a Sandbox. XPCOM is a cross-platform component object model, which is similar to Microsoft COM, and is required for file and memory management, basic data structures and so on. If when running your Mozilla Firefox web browser on Windows 10/8.1, you receive a Couldn’t load XPCOM error message, every time you run it, here are a few things you may want to try to troubleshoot and fix the issue.