Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

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Argivearre

compatibility error

Firefox Ynstallaasje en updates
cor-el replied 2 jierren lyn
berkell990
berkell990

After today's W10 update, I'm getting an error on Firefox:

XULRunner: Error: Platform version 129.0.2 not compatible with 

minVersion >= 128.0.2
maxVersion <=128.0.2

What do I do now? It's a Lenovo 64 bit machine.

After today's W10 update, I'm getting an error on Firefox: XULRunner: Error: Platform version 129.0.2 not compatible with minVersion >= 128.0.2 maxVersion <=128.0.2 What do I do now? It's a Lenovo 64 bit machine.

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cor-el
cor-el
  • Moderator

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 reinstall Firefox and possibly 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: