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Firefox won’t open on my desktop, just an error message

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  • 最后回复者为 cor-el

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Error message is XULRunner Error:Platform version’121.0’ is not compatible with Min version>=120.01 Max version<=120.01

Error message is XULRunner Error:Platform version’121.0’ is not compatible with Min version>=120.01 Max version<=120.01

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More info please... Post screenshots of the issue. What OS and version? If Linux, what desktop? X11 or Wayland?

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An error message like XPCOM missing or about platform version or entry points not found can happen because of a failed Firefox update that left you with a mixture of old and updated files in the Firefox installation 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 need to do a clean reinstall and remove the Firefox program folder to ensure that all files are replaced. You may have to disable security software temporarily in case the problem persists.

Reinstall Firefox: