Firefox on't open; error message = Platform '5.0' not compatible with minversion =2.01 maxversion =2.01

Just installed Firefox 5.0 yesterday. No problems till now.
Came in for the day. Had last used Firefox about 3 hours earlier without incident. Tried to open, but message said it was already open so I should restart it, or failing at that, restart my system. After rebooting, I get this eror message when I try to open Firefox.
"Platform '5.0' not compatible with minversion>=2.01 maxversion<=2.01"

The updater wasn't able to update all the files and some were left as older versions. 
You need to 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 [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.

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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.

Can't open re-installed Firefox - get this message: Error: platform version5.0 is not compatible with minVersion = 6.0 maxVersion = 6.0

Had to uninstall Firefox as it stopped working. The went to website and downloaded Firefox once more. Pressed the .exe and the file went through the installation okay, but when I tried to open Firefox I get:
Error: platform version5.0 is not compatible with
minVersion > = 6.0
maxVersion < = 6.0
The only option i have is to press OK and nothing else happens.
Can you offer any help - it is beyond me and I am missing Firfox and have lost all my bookmarks.

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.

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.

Problem connecting to internet via Firefox as XUL Runner Error Platform version is not compatible with minVersion 1.9.2.16 max version 1.9.2.16

Firfox requested to update previous version to new version of which i allowed. After installation complete i tried to connect to the internet and was denied with a following error window appearing. As explained above i shall explain again as shown in the error window.
XULRunner
Error: Platform version " is not compatible with
minVersion >= 1.9.2.16
maxVersion<= 1.9.2.16
This will not allow me to connect to the internet as i would like to continue to.
Please restore if possible my previous toolbar and able for me to connect to the internet.
Thank you.

This issue can happen when the updater wasn't able to update all files in the Firefox program folder.
Do a clean (re-)install:
* Download a fresh Firefox copy and save the file to the desktop.
* Firefox 4.0: http://www.mozilla.com/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.
* Don't 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

When i try to open email (thunderbird) this is what I get: Error platform version is not compatible with minVersion =1.9.2.15 maxVersion =1.9.2.15 I understand this is a firefox issue. can you help? thanks, Jane

i have also tried to uninstall firefox to no avail
when i try to download 3.6.15 it works to 100% then is searching for viruses and there it stops.
i can get on the internet with firefox... but can't get to my email using thunderbird... but i was told the problem is a firefox issue.
yikes. i'm in over my head.

I had already tried a reinstall before, but thanks for the suggestion. Starting FF in Safe mode did not help either.
XULRunner is specific to FF. Mostly found discussion about using the code in web pages when I used Google before posting.
When FF went from version 3.6.14 to version 3.6.15 this issue started. Please note the Error message and the version info I just mentioned.
'''"Platform version '1.9.2.15' is not compatible with minVersion > =1.9.2.14 maxVersion < = 1.9.2.14"'''
'''The Platform was revved up from 1.9.2.14 to1.9.2.15'''
I could not find information on: minVersion or maxVersion much less how to change them in XULRunner.
'''''It is definitely a Mozilla FF issue'''''.
Avast sandbox is up to date and works just fine with everything else. More importantly it worked just before the update was installed.
The only reason I bothered with the update is because Mozilla touted it as a security issue and there was NO mention of any known issues with sandbox software.

Received Error: Platformvwersion "7.0.1" not compatible with Minversion:1.9.2.13 Maxversion:1.9.2.13 Can't get Firefox to work and no email with Thunderbird?

Firefox running well on IBM compat Windows 7/64 bit. No Outlook so adding Thunderbird. Added Thunderbird and received the Error: Platform version "7.0.1" NOT compatible with: Minversion: 1.9.2.13 Maxversion: 1.9.2.13

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

I have the latest Firefox v 26 and everytime I try to add-on Lightning, I get the error message that it is not compatible with Version 26?

"Lightning could not be installed because it is not compatible with firefox 26.0" is the message I get when I try to install the latest 2.6.4 version of lightning. I also tried the later beta test version with the same results. I am running Windows XP 32 bit with all the latest updates.

hello Waltair, lightning is a calendar-extension for the thunderbird mail client - it won't work in firefox...

I am running mac osx 10.5.8, but FireFox is giving me a message that it is not compatible with my version of osx and will not let me install. The web site says it is compatible with osx 10.5. Am I missing something?

I was able to download the current version of FireFox but when I tried to install, I got a message that FireFox is not compatible with my current os. What else should I consider or try doing to get FireFox to work?

Beginning with Firefox 4, Macs must have an Intel x86 processor (which you do NOT have; yours is a PPC Mac) '''''and''''' OSX 10.5 or higher.
*System Requirements: [https://www.mozilla.org/en-US/firefox/4.0/system-requirements/index.html Firefox 4] [https://www.mozilla.org/en-US/firefox/5.0/system-requirements/index.html Firefox 5] [https://www.mozilla.org/en-US/firefox/6.0/system-requirements/index.html Firefox 6] [https://www.mozilla.org/en-US/firefox/7.0/system-requirements/index.html Firefox 7] [https://www.mozilla.org/en-US/firefox/8.0/system-requirements/index.html Firefox 8]
'''''The good news''''' is that Firefox 3.6.24 still supports OSX 10.4 and Macs with the PPC Mac architecture. '''''The bad news''''' is that support for the Firefox 3.6.x series is likely to end in the first quarter of 2012.
*System requirements: [https://www.mozilla.org/en-US/firefox/3.6/system-requirements/index.html Firefox 3.6.x]
*Download Firefox 3.6.24: https://www.mozilla.org/en-US/firefox/all-older.html
*Also see --> http://support.mozilla.com/en-US/kb/Installing+Firefox+on+Mac
You can try the third-party product '''''TenFourFox''''' that supports PPC Macs. Firefox 8 version of '''''TenFourFox''''' is available. The product is based on Firefox released versions. All support is provided by the developer, not by this site:
*Home page: http://www.floodgap.com/software/tenfourfox/
*Developer's blog: http://tenfourfox.blogspot.com/
*'''''VERY IMPORTANT'''''; '''read this carefully''': https://code.google.com/p/tenfourfox/wiki/PluginsNoLongerSupported
'''If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.'''

I updated my old mac Mini to OSX10.5 (Leopard) and installed the latest version of Firefox, only to get a message that it 'is not compatible with this architecture'. Any suggestions on how to get a superior web browser back?

Upgraded old Mac mini (from 10.4 to 10.6) PowerPC G4 Processor, downloaded latest version of Firefox and ran installer, got a dialogue box that said 'not compatible with this architecture', now I don't have Firefox at all, and it is my preferred browser.

Firefox '''4 versions and later do not run on a PowerPC Mac''' and require at least OS X 10.5 and an '''Intel Mac'''.
The''' latest supported version for your os is 3.6.26''' , you can download it from:
http://www.mozilla.org/en-US/firefox/all-older.html
see for more info:
[http://www.mozilla.org/en-US/firefox/3.6/system-requirements/ Firefox 3.6 System Requirements]
[http://www.mozilla.org/en-US/firefox/10.0.1/system-requirements/ Firefox 10.0.1 System Requirements]
[For older Macs that aren't supported in Firefox 4+ versions, if you like, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8]
http://www.floodgap.com/software/tenfourfox/
http://tenfourfox.blogspot.com/
https://code.google.com/p/tenfourfox/wiki/PluginsNoLongerSupported
thank you
Please mark "Solved" the answer that really solve the problem, to help others with a similar problem.

I tried opening firefox this morning which it would not let me do, instead I received an error message that read: error-Platform version 10.0.1 is not compatible with minversion =10.0,maxversion =10.0" I am not sure what I can do. Thank you

I noticed that firefox updated last night before I shut down my computer, then when I turned it on this morning I received the error message I described above. It will not let me open firefox.

I solved the problem by reinstalling the updated version and it now works fine. Thank you for getting back to me so quickly.

When I double-click the desktop icon I get an error message: XUL RUNNER error: Platform version '2.0.1' is not compatible with minVersion =5.0 maxVersion =5.0. I must right click the icon and choose 'RUN OUTSIDE THE SANDBOX' to open the browser.

This problem occurred shortly after updating to Firefox 5.0 I kept getting reminders to update to 5.0 When I finally decided to update, the first 4 or 5 attempts failed for one reason or another always with a different error message At some point after and extended shutdown of the computer 5.0 was initiated.

The updater wasn't able to update all the files and some were left as older versions.
You need to 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 [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 get the following message when I attempt to start Firefox 5.0 - Error: Platform version 2.0.1 is not compatible with minVersion = 5.0 maxVersion = 5.0

I was asked to upgrade to version 5.0 tonight. As soon as I upgraded, Firefox stopped working with the above error. I tried uninstalling and reinstalling several times, but I got the same message.

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.

After installing Firefox 6.0 and attempting to open the browser I get: Error: Platform Version '5.0.1' is not compatible with MinVersion = 6.0 MaxVersion = 6.0

I am running a Windows 7 computer with ZoneAlarm internet security.

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.

Firefox on't open; error message = Platform '5.0' not compatible with minversion =2.01 maxversion =2.01

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