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Aug 12, 2018 - This issue would normally be fixed with a clean reinstall that involved deleting the Firefox program folder. 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. Follow the below given steps to learn how to fix firefox couldn’t load XPCOM in Windows. How to fix Firefox Couldn’t Load XPCOM Windows 8.1/8/7 – Steps to Follow. What we are going to do here is perform clean uninstallation of mozilla firefox and removing residual registry files of mozilla firefox.
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 packagemanager, 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 packagefrom the Firefox download page, simply remove thefolder 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 scannerif 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+ModeThis shows how to Start all Computers in Safe Mode;Free Online Encyclopedia