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XULRunner: Error: Platform version '95.0.1' is not compatible with minVersion >= 95.0 maxVersion <= 95.0

  • 4 replies
  • 1 has this problem
  • 535 views
  • Last reply by cor-el

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Hello.

I have two profiles, for separating work and personal tabs/bookmarks/etc. I wanted to update Firefox from 95.0 to 95.0.1 but in both profiles I saw "Firefox is being updated by another instance" in the About Firefox dialog when both were running. So I closed one of them and the other offered me the usual button to update immediately. I did it, restarted that Firefox instance/profile, which restarted normally, but now the second one does not open. Instead, I get the error transcribed above in the subject (see attached screenshot).

So my question is: please, how do I regain access to my second profile without losing that profile's data?

Hello. I have two profiles, for separating work and personal tabs/bookmarks/etc. I wanted to update Firefox from 95.0 to 95.0.1 but in both profiles I saw "Firefox is being updated by another instance" in the About Firefox dialog when both were running. So I closed one of them and the other offered me the usual button to update immediately. I did it, restarted that Firefox instance/profile, which restarted normally, but now the second one does not open. Instead, I get the error transcribed above in the subject (see attached screenshot). So my question is: please, how do I regain access to my second profile without losing that profile's data?
Attached screenshots

Chosen solution

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.

You can find the full installer of the current Firefox release (95.0.1) in all languages and all operating systems here:

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Chosen Solution

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.

You can find the full installer of the current Firefox release (95.0.1) in all languages and all operating systems here:

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But the installation was successful. Unfortunately only for one of the profiles, and the other one didn't quite "get" that it would now work with a 95.0.1 application rather than the old 95.0 one.

Since it's only one of the profiles that isn't working under the updated Firefox, and since the issue is clearly the version stated somewhere inside that profile, how can I edit those minVersion and maxVersion variables so that it (the troublesome profile) accepts to be opened by the new version? Is it is a JSON file, an INI file, or some other kind of file, and which one, and is it pure text or hexadecimal or what?

I am writing this in my primary profile, the one I used to update Firefox 95.0.1 and that is working fine. So, again, the issue is not the Firefox installation itself, but simply the secondary profile.

Then again, how should I proceed to update Firefox when a new version arises? Because this is not acceptable and multiple profiles is a (great) feature.

BTW, is https://bugzilla.mozilla.org/show_bug.cgi?id=1480452 involved here?

Modified by a.r

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The proposed solution does work. Sorry.

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The issue you mentioned about the "XULRunner: Error: Platform version '95.0.1'" is not profile specific, but is about the Firefox installation folder and the way to fix this is a clean reinstall that includes removing the Firefox program folder to ensure a proper installation.

If you have a problem with specific profiles then this is a problem with this profile.

Can you post a screenshot that shows an error message about this profile ?