XUL Runner Error
Possibly there was an auto update of MOZILLA FIREFOX on our DELL LAPTOP (Windows 11). Now, we cannot get a Mozilla window to open - due to error message:
XUL Runner Error: Platform version '118.0.1' is not compatible with minVersion >= 118.0 maxVersion <=118.0
Can someone please help us get back to a previous version of Mozilla Fire. Perhaps it is a Windows error. I have no way of knowing. Please help me. My email is: [removed email from public] Thank you.
Modified by James
Chosen solution
I fixed the problem. I had to uninstall and re-install MOZILLA FIREFOX. All OK now.
Read this answer in context 👍 3All Replies (3)
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. 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.
Modified by cor-el
Chosen Solution
I fixed the problem. I had to uninstall and re-install MOZILLA FIREFOX. All OK now.
The XUL Runner error message, is a large, stupid and annoying bug that appears after many updates.