Firefox will not start (platform version not compatible)

After an automatic upgrade, Firefox no longer starts, giving an error of the form:
"Error: Platform version '1.9.2.6' is not compatible with minVersion >= 1.9.2.7 maxVersion (LT)=1.9.2.7"
I have seen several questions regarding this issue on this site but the answer given is always just to do a clean reinstall. This does fix the problem but it comes back next time I upgrade. I've had to do five clean reinstalls in a row now! Is there no better solution?
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

It is possible that not all files were updated to the new version.
Do a clean reinstall and download a fresh Firefox copy from http://www.mozilla.com/firefox/all.html and save the file to the desktop.
Uninstall your current Firefox version and remove the Firefox program folder before installing that 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.
You can skip the step to create a new profile, that is not necessary for this issue.
See http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

Similar Messages

Firefox will not load error msg: error platform version 7.0.1 is not compatible with minVersion =7.0 maxVersion 7.0

The above question. Firefox will not load. During firefox update, I stopped it and now when I click on the firefox icon, I get the above error msg

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]]

Firefox will not start after I downloaded the newest version

Firefox used to work on my computer but will not start now that I have downloaded the newest version.

See [[Firefox will not start]]
If you issue is resolved by this post please click Solved it! so we can assist others.

MAC 0S 10.3 FIREFOX WILL NOT START--THE OLDER VERSION WORKED PERFECTLY-- HOW DO I GET IT FOR MY WIFE'S COMPUTER

an update was sent to my wife's computer. she tried to use it ,but it would not open. the older version worked fine ,but it was erased by the upgrade. How do we get the old version back? the upgrade--yahoo_firefox_3.6_set_us.dmg-firefox will not open.

The last version of Firefox that works in OS 10.3 is Firefox 2.0.0.20, you can get it from ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/2.0.0.20/mac/en-US/

Firefox will not start and I get firefox.exe Application Error with the code 0x00000000, I've tried reloading but always get the same error message!

Firefox will not start, I've tried opening in safe mode, no joy. I get the firefox.exe application error 0x00000000
== This happened ==
Every time Firefox opened
== Possibly after a windows update ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; YPC 3.2.0; .NET CLR 1.1.4322; InfoPath.1)

Do a clean reinstall and download a fresh Firefox copy from http://www.mozilla.com/firefox/all.html and save the file to the desktop.
Uninstall your current Firefox version and remove the Firefox program folder before installing that 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.
See http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

I started working for ChaCha, and now firefox will not work unless I manually close it in the process tree every time I want to use it. I also cannot open more than 1 page at a time.

I started working for ChaCha 11/26/2010, I had to download a program to take incoming questions.
Ever since then, Firefox will not work correctly, even if I am totally logged out of ChaCha, and the page is closed, if I try to open my browser using Firefox, it will not open, I have to go into the processor tree and manually end Firefox, then it will work, but it will only let me open 1 page at a time. For example I have Firefox open now, but if I go and click on the icon to open it in a new browser, it will not open, I either have to close this, or use IE-I HATE IE lol.
I cannot use the ChaCha add on you have because it is not for the new version of Firefox, please help, I love Firefox, but not being able to open more than one window/page at a time does not cut it, nor does having to manually stop it from processing. I have tried re-installing it too.
Thank you, Melinda

I should add that I face the same problem with Safari and Google Chrome.

Just installed Firefox 3.6. Firefox will not start and Firefox safemode does not start either. Using Task manager I do not see if started either. If I create a new profile and start from that window, Firefox starts up. I see no error windows/messages. I d

Just installed Firefox 3.6. Firefox will not start and Firefox safemode does not start either. Using Task manager I do not see if started either. If I create a new profile and start from that window, Firefox starts up. I see no error windows/messages. I do have it listed in my Firewall as an exception program with Permit All. What is happening?
== This happened ==
Every time Firefox opened
== After removing Firefox and Reinstalling it. ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; GTB6.4; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648; MS-RTC LM 8)

If that new profile works then you can transfer some files from the old profile to that new profile (be careful not to copy corrupted files)
See http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox
See also [[Basic Troubleshooting|#Make_a_new_profile|Basic Troubleshooting: Make a new profile]]

After removing system fonts and reinstalling fonts, FireFox will not start

After removing system fonts and reinstalling fonts, FireFox will not start! When I start FireFox the "Mozilla Crash Reporter" opens as if FF just crashed??? I don't see any records in event viewer. I am using FF v3.6.3 on a Windows 7 box. I tried uninstalling 3.6.3 and installing 3.0.18 and had the same problem!
== This happened ==
Every time Firefox opened
== After a uninstalled all fonts including system fonts and then reinstalling system fonts. ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; GTB6.4; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; AskTB5.5)

The files with submitted crash report ids are inside the ''submitted '' directory, from the directory you found the LastCrash.txt timestamp file.
The file names will begin with '''bp-'''
There might be more information from the crash report, but it might just tell us you are crashing the first time Firefox tries to use a font.
One thing I suppose you could do is select only those fonts you've got in Tools -> Options -> Content -> Fonts and Colors -> Advanced and then uncheck the '''Allow pages to use their own fonts''' option.
See http://support.mozilla.com/en-US/kb/Options+window+-+Content+panel#Fonts_Dialog
To be honest, I can't find anything on this Netscape Font Navigator and it sounds highly dubious.

Firefox will not start or open at all

I have been using Firefox on a PC with Windows Vista 64-bit OS, but suddenly Firefox will not even open up on this PC. I have uninstalled and re-installed FF (different versions of it such as 24, 27, 30 & 32), but nothing seems to work. Restarting my PC does not help either. I have read several of the articles on Mozilla Support (including "Firefox Won't Start, Find Solution") and some of them say it could be due to a problem with my Profile or Add-ons or Plug-ins. If I am supposed to fix one of those issues, the problem is that I cannot even open Firefox (not even in Safe Mode) to get into those selections.
I like Firefox more than IE or Chrome, and would appreciate anyone's help to fix this problem.

FredMcD, thanks again for taking the time to help. I changed the "Connection Settings" to "No proxy," and then upgraded to FF 32.0, but it did not open up. So I am back to 24.0. If you have other ideas, I am willing to try it out so that I can upgrade to the latest FF version.
On a different Firefox topic, I imported my "Favorites" list from IE to FF, and I do see them when I go through the "Bookmarks" tab on the very top of the screen. Then under "View" tab, I have selected "Bookmarks Toolbar" which places a direct link called "From Internet Explorer" a couple of lines below the main toolbar (my idea is to save a few clicks if I want to go to my IE Favorites. However, when I click on that direct link, I only see 3 entries ("Customize links"; "Suggested sites" and "Web Slice gallery," but I do not see the many entries that should be there from my IE Favorites list. The strange thing is that until a few days ago I used to see all my IE Favorites when I clicked on this direct link! What should I do?

Firefox will not start at all

New versions of Firefox will not start and only bring up the crash reporter. I've tried starting in safe mode, I've deleted/created new Profiles and I've uninstalled/installed Firefox over and over. I can still download 28.0 and it has no problem opening. Below is the latest Crash ID from 35.0
Crash ID: bp-4ac8fb2d-9a2a-4a6a-a9e4-06cc42150125

hello sid.robinson, this crash is caused by the "Digital Guardian" software by Verdasys that is running on your computer. Please see if there's an update available for that program.

After upgrading to 27, firefox will not start. Saw an error message during the upgrade process.

After upgrading to 27, firefox will not start. Saw an error message during the upgrade process but cannot remember.
Tried to run firefox.exe -P but receive error message:
XML Parsing error: undefined entity
Location: chrome://mozapps/content/profile/profileSelection.xul
Line number 18, Column 1:
<dialog
^
Running on Windows XP SP3. No problem whatsoever before upgrading to 27. Sending this from Chrome as I cannot open Firefox at all.

Thanks jschaer2000: after starting it once in safe mode, I closed Mozilla and tried several restarts in normal mode. So far, all worked:-)
Thank you very much again.
Still the automatic update process bothers me: it took me several days to discover the reason to the malfunction, since when I removed the problematic version from Add and Remove Programs, I didn't pay attention at first that it was another version, not v26 which I installed from my folder.
In addition, I like to save the installation files before I run new programs and if I didn't have v26 exe file, I couldn't have operated Mozilla at all. Not that it was fun to remove and install again each time v27 didn't react, but it was better than nothing, I still prefer Mozilla over its competition.

Firefox will not start any more.

Firefox will not start. (reported as a hang)

Try Application > Utilities > Activity Monitor and look in the Process Name column to see if there is a version of Firefox there. If so, select it and then hit the Quit Process icon.
Restart Firefox.
Recently, Firefox has repeatedly started hanging on my 10.7.2 iMac.
If that is not it, try Carolyn's suggestion.

After updating iTunes to latest version, Firefox will not load.

I installed the new version of iTunes that supports ios6 this morning. Right after that Firefox will not start. It flashes some kind of message in the lower right corner that I cannot read. Task Manager says it is running, but not on my screen.

Look in Processes in the Task Manager. If Firefox is running, you see firefox.exe in there. You can remove it from there.

Firefox will not let me uninstall version 6 .it says it is a corrupt file plus no icons work

firefox will not let me uninstall version 6.says corrupt file.plus no icons working on desktop

-> Restart your System in Safe Mode
* http://windows.microsoft.com/en-US/windows7/Start-your-computer-in-safe-mode
-> Uninstall your current Firefox
* https://support.mozilla.com/en-US/kb/Uninstalling%20Firefox
* DO NOT SELECT TO REMOVE USER DATA AND SETTINGS
* Restart your system
-> Download latest Firefox version from one of these links using some other Web Browser:
* http://www.mozilla.com/en-US/firefox/new/
* http://www.mozilla.com/en-US/firefox/central/
* http://www.mozilla.com/en-US/firefox/fx/
* http://www.mozilla.com/en-US/firefox/all.html
-> Install Firefox using the downloaded & saved Firefox installer file
* https://support.mozilla.com/en-US/kb/Installing%20Firefox%20on%20Windows
Check and tell if its working.

Firefox will not open or won't start (see /questions/964132 )

was Ok till recently

Please include more information, such as your Operating System (Windows?) and version, plus exactly what happens when you try to start Firefox. The information that's listed in a recent Firefox crash report, if available, might also help. See [[Firefox crashes]] under '''Get help fixing this crash''' and post any crash Report IDs recently submitted (they'll start with '''bp-''' )
Your question title says "Firefox will not open or won't start (see /questions/964132 )" I looked at that question and it was started by another Firefox user. [/questions/964132?page=2#answer-477049] has a number of suggestions if Firefox won't start. Which ones did you try?
For other possible solutions see
* [[Basic Troubleshooting]]
* http://kb.mozillazine.org/Browser_will_not_start_up
*[/questions/958850] ''Firefox won't open after restart''
Note: A "clean reinstall" was one of the suggestions in [/questions/964132]. It means removing the Firefox application files and then reinstalling Firefox from a fresh download, as explained in the "Reinstall Firefox" step in [[Basic Troubleshooting]]. If that allows you to start Firefox, but if the problem returns after restarting the computer, you should do another "clean reinstall" and then troubleshoot your plugins by disabling all of them, as suggested in the [[Basic Troubleshooting]] article.

I click on the icon and firefox will not start or try to start

I installed Avery labels and then had trouble with tool bar remover avery but now firefox will not start up when i click on icon. I removed Firefox and reinstalled but will not run.
== This happened ==
Every time Firefox opened
== 5/19/2010 ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; FunWebProducts; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; msn OptimizedIE8;ENUS)

It sounds like you may have a problem caused by an extension (maybe that avery toolbar)
[[Troubleshooting extensions and themes|Try the instructions in this article]] - begin by putting Firefox in Safe Mode. If Firefox will start in safe mode, continue with the section [[Troubleshooting extensions and themes|#Disable_all_extensions|Disable all extensions]] and then [[Troubleshooting extensions and themes|#Test_for_faulty_extensions|Test for faulty extensions]]
I hope that helps. Let us know if you can.

Firefox will not start (platform version not compatible)

Similar Messages

Maybe you are looking for