If you cannot open Mozilla Firefox due to the error, you can turn to another installed browser. The XPCOM error in Firefox commonly occurs after a Windows Update and may be caused by various factors like third-party extensions. According to the reports from affected users, they cannot open Firefox and only get a Firefox dialog saying “Couldn’t load XPCOM” on screen. Today, we will discuss the couldn’t load XPCOM Firefox error. Firefox is the third-most popular web browser after Google Chrome and Safari. It is available for multiple operating systems, including Windows 7 or newer, macOS, and Linux. Mozilla Firefox, or simply Firefox, is a free and open-source web browser used by a large number of users. Solution 2: Start Firefox In Safe Mode and Disable Extensions.Solution 1: Run Your Firefox As Administrator.Here, MiniTool Partition Wizard explores some feasible methods to fix “Firefox couldn’t load XPCOM” in Windows 10. If you are experiencing the same problem, you are in the right place. Many users complain that they cannot open Firefox browser due to the “Couldn’t load XPCOM” error.
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