Received the following Error Msg: Platform Version '6.0' is not compatible with minVersion =6.01, maxVersion =6.01

When I brought up my machine this afternoon, it started to download 6.0.1 and then I received an error msg from ZoneAlarm requesting that I upload an error file. This occurred several times, and then I uninstalled the Firefox files and again downloaded 6.0.1. At this point I then received the Version 6.0/6.0.1 error msg.

If you use ZoneAlarm Extreme then you may have to disable that during the installation to prevent ZA from blocking access to some files in the Firefox program folder (C:\Program Files\Mozilla Firefox\).
Download a fresh Firefox copy and save the file to the desktop.
* Firefox 6.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Uninstall your current Firefox version.
* Do not remove personal data when you uninstall the current version.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
* It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.
* http://kb.mozillazine.org/Profile_folder_-_Firefox

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The new upgrade to Firefox 4.0 has rendered the browser useless. Error message is XUL Runner Platform Version 2.0.1 not compatible with minVersion =2.0 maxVersion =2.0. How do I get any version of Firefox to load again?

XUL Runner Platform Version 2.0.1 not compatible with minVersion>=2.0 maxVersion<=2.0

Do a clean (re-)install:
* Download a fresh Firefox copy and save the file to the desktop.
* Firefox 4.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Firefox 3.6.x: http://www.mozilla.com/en-US/firefox/all-older.html
* Uninstall your current Firefox version and remove the Firefox program folder before installing that copy of the Firefox installer.
* Do not remove personal data if you uninstall the current version.
* It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
Your bookmarks and other profile data are stored elsewhere (not in the Firefox program folder) and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.

Error: Platform version '25.0' is not compatible with minVersion = 26.0 maxVersion = 26.0 HELP!

Hi All,
I keep getting this error message when opening Firefox on my computer. However, if I run it as an Administrator it works fine. I have uninstalled and reinstalled Firefox including downgrading to older versions and still no luck. This is the Error I get:
Error: Platform version '25.0' is not compatible with minVersion > = 26.0 maxVersion < = 26.0 edit
Any help would be greatly appreciated.

If you use ZoneAlarm Extreme Security then disable Virtualization and reinstall Firefox. 
Other security software may have similar features to prevent Firefox from updating files properly.
See these pages for a similar issue with corrupted files:
*http://kb.mozillazine.org/Browser_will_not_start_up#XULRunner_error_after_an_update
Do a clean reinstall and delete the Firefox program folder before (re)installing a fresh copy of the current Firefox release.
Download a fresh Firefox copy and save the file to the desktop.
*Firefox 26: http://www.mozilla.org/en-US/firefox/all.html
if possible uninstall your current Firefox version to cleanup the Windows registry and settings in security software.
*Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you lose personal data like bookmarks and passwords from profiles of other Firefox versions.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
*(32 bit Windows) "C:\Program Files\Mozilla Firefox\"
*(64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\"
*It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
*http://kb.mozillazine.org/Uninstalling_Firefox
Your bookmarks and other personal data are stored in the Firefox profile folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.
If you keep having problems then also create a new profile.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

Firefox 6.0 will not run if Zone Alarm is active, gives error: XULRunner, Error Platform Version 6.0 is not compatible with minVersion + 6.0 maxVersion = 6.0

Windows 7
If Zone Alarm is disable Firefox runs

Try to ask in the ZoneAlarm forum.
*http://forums.zonealarm.com/

I need to silently upgrade from 3.5 to 7 but get an error message after 7 install. Platform version 7.0 is not compatible with minVersion = 1.9.1

I'm trying to silently upgrade my environment to FF 7. I've gotten the silent install working great, it puts in my Proxy Server info, reassigns the home page and all that. But, the last version we pushed out was FF 3.5. If a user had that on their PC and they run the FF7 install, they get weird messages when clicking on the icon.
XULRunner: Error: Platform version '7.0' is not compatible with minVersion >= 1.9.1 maxVersion <=1.9.1
Another message they get is:
AutoConfigAlert:
Netscape.cfg/AutoConfig failed. Error: pref failed: [Exception... "Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsIPrefBranch.setBoolPref]" nsresult: "0x8000ffff (NS_ERROR_UNEXPECTED)" location: "JS frame :: prefcalls.js :: pref :: line 70" data: no]
This is on Windows XP

Do you have other virtualization or security software that might protect .ini and possibly other files in the Firefox program folder (C:\Program Files\Mozilla Firefox\) and prevent Firefox from updating them properly?
You need to do a clean reinstall.
Download a fresh Firefox copy and save the file to the desktop.
* Firefox 7.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Uninstall your current Firefox version.
* Do not remove personal data when you uninstall the current version or you lose your bookmarks and other data in the profile folder.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
* It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.
* http://kb.mozillazine.org/Profile_folder_-_Firefox
* http://kb.mozillazine.org/Profile_backup

Downloaded firefox 5.0.1 last night, worked fine, Turned computer on today, Mozilla Firefox, it won't start. Get error message, Error: Platform version '5.0' is not compatible with minVersion =5.0.1 maxVersion =5.0.1" What do I need to do to fix it?

We downloaded firefox 5.0.1 last night, began working with it. It did fine. After about an hour, I turned off my computer. When I turned on my computer, I click on Mozilla Firefox and it won't start. I get this error message, " Error: Platform version '5.0' is not compatible with minVersion >=5.0.1 maxVersion <=5.0.1" from XUL Runner. What do I need to do to fix it?

The updater wasn't able to update all the files and some were left as older versions. 
Do a clean reinstall.
Download a fresh Firefox copy and save the file to the desktop.
* Firefox 5.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Uninstall your current Firefox version.
* Do not remove personal data when you uninstall the current version.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
* It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.
* http://kb.mozillazine.org/Profile_folder_-_Firefox
* http://kb.mozillazine.org/Profile_backup

XUL Runner, Error: Platform version 5.0 is not compatible with miniVersion =6.0 maxVersion =6.0

I get this error message when open Mozilla Firefox:
XUL Runner, Error: Platform version 5.0 is not compatible with miniVersion>=6.0 maxVersion<=6.0

The updater wasn't able to update all the files and some were left as older versions. 
Do a clean reinstall.
Download a fresh Firefox copy and save the file to the desktop.
* Firefox 6.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Uninstall your current Firefox version.
* Do not remove personal data when you uninstall the current version.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
* It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.
* http://kb.mozillazine.org/Profile_folder_-_Firefox
* http://kb.mozillazine.org/Profile_backup

Downloaded Firefox 6.0.2 and when launching get XUL Runner "Error: Platform version 6.0 is not compatible with minVersion =6.0.2 maxVersion =6.0.2

After downloading Firefox version 6.0.2 launching get XUL Runner "Error: Platform version 6.0 is not compatible with minVersion>=6.0.2 maxVersion<=6.0.2

If using Zone Alarm's browser virtualization or any other similar product or a sand-boxing program (i.e., Sandboxie), turn it off when updating Firefox or Firefox Add-ons. You can post on the forum for any such product that you might be using to get other instructions on the proper use of the product.
The updater wasn't able to update all the files and some were left as older versions. Do a clean reinstall. See: [http://kb.mozillazine.org/Browser_will_not_start_up#XULRunner_error_after_an_update Browser will not start up - XUL Runner error after an update]
#Download a fresh Firefox copy and save the file to the desktop.
#*Firefox 6.0.x: http://www.mozilla.com/en-US/firefox/all.html
#Uninstall your current Firefox version.
#*'''''Do not remove personal data when you uninstall the current version'''''
#*Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.
#*See [http://support.mozilla.com/en-US/kb/uninstalling+Firefox Uninstalling Firefox] '''''and''''' [http://kb.mozillazine.org/Uninstalling_firefox Uninstalling Firefox (Mozillazine)]
#*Also see: [http://support.mozilla.com/en-US/kb/Backing+up+your+information Backing up your information] '''''and''''' [http://kb.mozillazine.org/Profile_backup Profile backup (Mozillazine)]
#Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
#*It is important to delete the Firefox program folder/directory to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
#*See: http://kb.mozillazine.org/Installation_directory
#Install the fresh copy of Firefox that you downloaded in step 1

Error: Platform version 6.0 is not compatible with minVersion = 6.0.2 maxVersion = 6.0.2 so what do I do? Using Win 7

Error: Platform version 6.0 is not compatible with minVersion >= 6.0.2 maxVersion <= 6.0.2 so what do I do? Using Win 7 Home Premium

If you use ZoneAlarm Extreme Security then try to disable Virtualization and do a clean reinstall.
* http://kb.mozillazine.org/Browser_will_not_start_up#XULRunner_error_after_an_update
*[[/questions/869812]]
*[[/questions/869951]]

Error:platform version '33.03' is not compatible with minVersion -33.1.1 maxVersion -33.1.1

G'day all :)
I seem to be having major issues with Firefox not starting at all due to the above error appearing everytime I try to start Firefox.
I've uninstalled Firefox multiple times to no avail.
I've even gone into the registry and deleted these entries:
[HKEY_CLASSES_ROOT\FirefoxHTML]
[HKEY_CLASSES_ROOT\FirefoxURL\]
[HKEY_CURRENT_USER\Software\Mozilla]
[HKEY_CURRENT_USER\Software\MozillaPlugins]
[HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla]
[HKEY_LOCAL_MACHINE\SOFTWARE\mozilla.org]
[HKEY_LOCAL_MACHINE\SOFTWARE\MozillaPlugins]
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Mozilla]
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\mozilla.org]
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins]
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\FirefoxHTML]
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\FirefoxURL]
again,to no avail.
The error just keeps popping up.
I'm at a total loss here.
Any help would be greatly appreciated.
Thanks in advance :).

Thanks for your quick reply,but that did not work and still getting the same error.
I'm using Sandboxie,no other antivirus or firewall software.

After updating to the latest version for Win7 64 bit, I get the following error: Error: Platform version '6.0' is not compatible with: minVersion 6.0.1 MaxVersion 6.0.1

On the top of the above message is says XULRunner

I have exactly the same problem and my Zone Alarm Security software is causing the problem when I try to open Firefox, however this did not happen in any previous versions of Firefox I have had, including version 6.0.0
I would also greatly appreciate help on this one, or at least hope Mozilla will sort this out in another update.

I cannot open firefox anymore...I recieve the following error message....Error platform version '8.0'is not compatible with minversion = 7.0.1 maxversion = 7.0.1 How do I fix this?

cannot use firefox

The updater wasn't able to update all the files and some were left as older versions. 
Do a clean reinstall.
Download a fresh Firefox copy and save the file to the desktop.
* Firefox 5.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Uninstall your current Firefox version.
* Do not remove personal data when you uninstall the current version.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
* It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.
* http://kb.mozillazine.org/Profile_folder_-_Firefox
* http://kb.mozillazine.org/Profile_backup

Browser will not start due to error message: platform version 2.0 is not compatible with min version =2.0.1 or max version = 2.0.1

''locking as a dupe - https://support.mozilla.com/en-US/questions/834467''
This error message having somsething to do with XUL RUNNER

Download a fresh Firefox copy and save the file to the desktop.
* Firefox 5.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Uninstall your current Firefox version.
* Do not remove personal data when you uninstall the current version.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
* It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
Your bookmarks and other profile data are stored elsewhere in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder] and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.

I updated firefox to 6.0.1 today now it will not open just ...XUL Runner..Error: Platform version '6.0' is not compatible with minVersion =6.0.1 maxVersion =6.0.1 Help please!!

They is no info this all is it shows on screen

Are you using ZoneAlarm (Extreme)? 
If you have then try to disable that and do a clean reinstall of Firefox.
The updater wasn't able to update all the files and some were left as older versions.
Download a fresh Firefox copy and save the file to the desktop.
* Firefox 6.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Uninstall your current Firefox version.
* Do not remove personal data when you uninstall the current version.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
* It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.
* http://kb.mozillazine.org/Profile_folder_-_Firefox
* http://kb.mozillazine.org/Profile_backup

After installing Firefox 5.0 and attempting to open the browser I get: Error: Platform Version '2.0.1' is not compatible with MinVersion = 5.0 MaxVersion = 5.0 At the top of the message is Yul Runner

While installing Firefox 5.0 and attempting to open the browser I get: Error: Platform Version '2.0.1' is not compatible with MinVersion > = 5.0 MaxVersion < = 5.0
Above the message in the border was XULRunner

That can happen if the updater wasn't able to update (replace) all the files in the Firefox program folder (C:\Program Files\Mozilla Firefox\).
Download a fresh Firefox copy and save the file to the desktop.
* Firefox 5.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Uninstall your current Firefox version.
* Do not remove personal data when you uninstall the current version.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
* It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
Your bookmarks and other profile data are stored elsewhere in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder] and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.

Received the following Error Msg: Platform Version '6.0' is not compatible with minVersion =6.01, maxVersion =6.01

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