Firefox will not open; i have a MacBook, osx version 10.8.2

<blockquote>Locking duplicate thread. 
Please continue here: [[/questions/945539]]</blockquote>
When I try to launch firefox, it is not opening at all; at one point the firefox icon appeared at the top of the screen as if it was opening but it did not open

Try to repair the disk permissions:
*http://thexlab.com/faqs/repairprocess.html
Try to remove the Firefox plist file (org.mozilla.firefox.plist).
*http://www.macfixit.com/article.php?story=20060606082246983 How .plist files become corrupt and troubleshooting the results
Go to "~/Library/Preferences" and remove the plist file for Firefox (org.mozilla.firefox.plist)
Try to start Firefox in Safe mode:
*On Mac, hold down the Options key while starting Firefox
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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Firefox will not open; i have a MacBook, osx version 10.8.2; this is new since 12-28-12

when i click on firefox, it does not open; one time I saw it appear in the top part of the screen as if it was going to open but now it is not recognized at all; it was last updated 10-12.

Try to repair the disk permissions:
*http://thexlab.com/faqs/repairprocess.html
Try to remove the Firefox plist file (org.mozilla.firefox.plist).
*http://www.macfixit.com/article.php?story=20060606082246983 How .plist files become corrupt and troubleshooting the results
Go to "~/Library/Preferences" and remove the plist file for Firefox (org.mozilla.firefox.plist)
Try to start Firefox in Safe mode:
*On Mac, hold down the Options key while starting Firefox
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

Firefox will not open after fresh install in OSX Lion. "Firefox profile missing."

After recently upgrading OS X Snow leopard to OS X 10.7 Lion I downloaded and ran the Firefox installer package, only to find that Firefox could not open. The error message says "Profile missing – Your Firefox profile cannot be loaded. It may be missing or inaccessible"
I checked Firefox forums and found a script that when run in Terminal allows access to the (upper) Library folder; but this still does not solve the issue.
Obviously, with Lion Apple has deliberately placed a stumbling block in the way of would-be Firefox users.

Thank you. I solved the dilemma, which was one of my own making although I take no blame for it. You see, a while back I grew tired of going through the semantics of manually deleting Caches and Cookies and simply locked those folders (in Users/my name/Library) so that nothing could be added or removed from them without login credentials.
. . . There's where the fly got into the ointment. The Caches folder must be unlocked in order to run Firefox because it uses Caches to store files. Folder unlocked – problem solved.
It seems that OS X Lion has more warts than its predecessors (initially, at least), in that where Apple once gave the user full egress to all venues, it has developed a hard-nosed, up-in-your-face micro-managerial stance with Lion – such as making the System/Library invisible. This, of course, under the tacit label of "offering the user greater security" . . . against himself.
If you fully embrace that logic I've got some s. Florida realty I can dump I mean sell you on the cheap, lol.
I appreciate your kind help.
Thanks.
mike4444

Firefox will not open at all on macbook pro and then crashes mac entirely.

My firefox wont open when I've clicked the icon, though there is a little blue light underneath it. I've installed and re-installed it and still not working. When I do click the icon in the dock my entire macbook freezes and I have to manually restart it. I'm afraid my knowledge of stuff like this is exceedingly limited, I've read through numerous problem solving posts but I just don't understand the instructions others have given. This has previously happened to my firefox and i renamed the .exe(?) file and that made it work but I can't remember how I did it/can't find the post that helped me. I'm sorry to be so basic but I don't know anymore and want my browser working again!

You won't want Firefox to be a .exe file, thats for windows. Make sure its extension is .app. You can do this by going to Finder>Applications>Firefox>the right click and click the "Get Info" button. Then, about halfway down will be the file name with the extension. Change it to Firefox.app if it is not already like that.
Also, you can check out this [https://support.mozilla.org/en-US/kb/firefox-keeps-crashing-startup support article] if this doesn't help.
Have a great day!!
Jon

Firefox will not open - I have reinstalled and used the profile manager solution. It was fine earlier today. IE working fine.

I tried the suggested solutions including the 'clean install', any help would be most appreciated. I've used the Profile Manager, which is not much use when the browser won't even open to test it. I've also reinstalled twice, installed updates and restarted numerous times.
Firefox does do this on occasion, but usually sorts itself out - not this time.
Help!

You should check for malware or go back into regular mode and see if temorarily disabling your antivirus helps.
You can try these free programs to scan for malware, which work with your existing antivirus software:
'''Scan with all.'''
* [http://www.microsoft.com/security/scanner/default.aspx Microsoft Safety Scanner]
* [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware]
* [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility]
* [http://www.surfright.nl/en/hitmanpro/ Hitman Pro]
* [http://www.eset.com/us/online-scanner/ ESET Online Scanner]
Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article.

In Mac os 10.5.8 firefox will not open at all. Updated latest version, used time machine to get back to older version and still will not open. Have to force quit with message Firefox not responding

Crash reporter fails as well. Says report cannot be forwarded to Apple.

Hey kbroch,
Have you tried starting Firefox in Safe Mode? Hold down "shift" while Firefox is starting up. If the crash doesn't happen in Safe Mode, you should read [[Troubleshooting extensions and themes]].
There is also a lot of useful stuff in the [https://support.mozilla.org/en-US/kb/Firefox-not-start Firefox won't start] Knowledge Base article. If you've recently upgraded, you might want to check out [https://support.mozilla.com/en-US/kb/latest-firefox-issues#w_firefox-crashes-when-i-start-it this article] as well.
Hopefully this helps!

Firefox will not open after new update; Error: Platform version '1.9.2.13' is not compatible

After accepting the new update I got this error message when trying to restart Firefox:
XULRunner
Error: Platform version ‘1.9.2.13’ is not compatible with
minVersion >= 1.9.2.14
maxVersion <= 1.9.2.14
I have tried:
- Opening in Safe Mode; same error
- Uninstalling, deleting remaining info in C>ProgramFiles>MozillaFirefox folder, and reinstalling.
- Updating Avast antivirus in case that was interfering.
Now when I try to start Firefox I get this message;
Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.
But there is nothing happening in the Windows Task Manager. Please, somebody save me from Windows Internet Explorer!!

I experienced this error updating from Firefox 3.6.13 to 3.6.14 and resolved it by doing a 'clean' install' as described. It occurred again in updating from 3.6.14 to 3.6.15 and this time a clean install failed to rectify it. (Anyway, I don't want to have to go through this every time.)
Work-around: Shut down Firefox. Edit application.ini (typically "C:\Program Files\Mozilla Firefox\application.ini")
[Gecko]
MinVersion=1.9.2.15
Change to 1.9.2.13
Save. Start Firefox. Dirty? Yes. Works? Yes.
(Gecko is the forerunner or XULrunner)

I have no navigation bar and firefox will not open in safe mode to reset to default config. Reinstalling doesn't work. Any help please.

I have no navigation bar ever since I closed it to gain more space on the screen. It won't re-open. Firefox will not open in safe mode, but opens immediately in normal mode with the new improper config, so I cannot reset to default config. I erased Firefox and re-installed and it still opens with the same faulty config. Why does Firefox not give me the safe mode dialog box, why can I not re-open the nav bar, and how can I do these two things, please? Firefox is currently unusable for me without a nav bar and without access to the default settings in safe mode. I cannot research the extensions I'm running since I have no nav bar to go to Tools, Add-ons, Extensions.
== This happened ==
Every time Firefox opened
== I closed the navigation bar to gain more space on the screen and I couldn't re-open it. ==
== 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)

Hit the '''Alt''' key to show the Menu bar, then open View > Toolbars and select Menu bar and Navigation bar, so they have a check-mark.

I downloaded Firefox 5.0. Firefox will not open. States running offline. I have a Intel Pentium/Windows XP system.

I downloaded Firefox 5.0. Firefox will not open. States running offline. I have a Intel Pentium/Windows XP system.
This also happened when I tried to download Firefox 4.
Firefox 3.6.18 works fine

You may need to delete the Firefox program folder before (re)installing the latest Firefox. 
In case you still have problems after installing then check your security software.
A possible cause is security software (firewall) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls
*http://kb.mozillazine.org/Browser_will_not_start_up

I installed 4.0 and now firefox will not open, though it is running, I have uninstalled and re-installed and it still will not open?

I installed 4.0 and now firefox will not open, though it is running, I have uninstalled and re-installed and it still will not open. Not sure why this is happening

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 also:
*[[/questions/880050]]

I upgraded from 3.6.13 to Beta 4.0 and now Firefox will not open at all I tried to uninstall to start again but it will not uninstall either it does nothing.

I uninstalled Beta 4 and re-installed 3.6.13 now Firefox will not open at all I tried to uninstall to start again but it will not uninstall either it does nothing, I have been using Firefox for a long time but cannot resolve this problem can anyone help and give me a solution please. As I use Firefox as my web browser it is very frustrating.
The fact it will not uninstall appears to be something completely new as nobody I know who uses Firefox has ever encountered this in the past.

Did you check your security software (firewall)?
A possible cause is security software (firewall) that blocks or restricts Firefox without informing you about that, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process.
See [[Server not found]] and [[Firewalls]] and http://kb.mozillazine.org/Firewalls
If necessary then also see:
* http://kb.mozillazine.org/Browser_will_not_start_up
* http://kb.mozillazine.org/Error_loading_websites

Firefox will not open ANY site. Wont work AT ALL. Nothing seems to be working.

Firefox will not open ANY site. It worked last night, but not today. I uninstalled it many times, didn't worked. It displays the screen that says "unable to connect" yet chrome and explorer both work. I have disconnected and reconnected a few times, restarted my laptop, neither of those worked either. I have also tried turning "safe mode" off after re installing firefox, but again, that did not work. I need help :(.
Although, before this, firefox was not letting me use voice recording sites or any site that let me watch television online. It would load the commercials, but not play the episode. It wouldn't even let me upload pictures to photobucket. However, it worked using chrome or explorer.

Looks like a bunch of people have this problem. Anyone got any ideas to fix this???

Firefox will not open. Hangs at "connecting" stage. Non-responsive even to process shut-down via task manager.

Starting yesterday, Firefox will not open at all. It hangs at the "connecting stage." For hours. It will not shut down even using the task manager for applications or processes, and it locks up virtually every other application. I thought I managed to save an open Word document yesterday - it looked like a slow, but normal save during the Firefox hang, but the document was empty when I restarted my computer.
Even though my machine is not pentium 4 based, I tried starting using the Windows XP/M configuration, I downloaded and re-installed (over the top of) the existing version, I verified that no Mozilla processes were running before trying to start Mozilla, and tried creating a new profile. Absolutely no success. Every time (of the dozens) I have tried to start Firefox I have had to force a hard shut-down to get out of the application. I have now unpinned Firefox from my task bar because I keep forgetting and hitting it by reflex.
I am running version 11.0 (at least that is what I just downloaded - I am not positive what I was running yesterday). My system is Windows 7 Home Premium, Intel Core i3, 2.4 gHz, 4 GB RAM, 64 bit OS.
Next option is to restore to a previous version. If that doesn't work, I will uninstall and start over from scratch.

A possible cause is security software (firewall) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls
*http://kb.mozillazine.org/Browser_will_not_start_up

Firefox will not open unless I run it in compatibility mode (Windows XP SP 3), run it as an administrator, or launch it immediately after a reinstall (the reinstall thing only works once.) How do I fix this?

This morning, Firefox crashed. After this, when I click the Firefox icon, the hourglass appears and then nothing happens. Firefox does briefly appear in the task manager when I do this.
I tried rebooting. I tried reinstalling multiple times. (Firefox will run when I select "Launch Firefox" from the installer. Then the problem occurs again.) I tried safe mode. I have found that Firefox will work if I select Windows XP compatibility mode from the icon properties menu or if I run the program as an administrator. When I do this, Windows asks me if I want a program to be able to make changes to my computer.
I have noticed that a Windows Error Report is being generated each time Firefox will not open.

A possible cause is security software (firewall,anti-virus) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls

Firefox will not open after unlocking Sempron

After upgrading to a new motherboard and unlocking Sempron processor, Firefox will not open. I have tried Firefox (safe mode) and rolled back to a previous version, but to no avail. It worked fine when I ran the Sempron 140 as a single core (even overclocked to 3.17ghz) on Biostar A785GE motherboard. I cannot find a crash ID to link to.
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; (R1 1.6); Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; SLCC1; OfficeLiveConnector.1.5; OfficeLivePatch.1.3)

Maybe you restored to a version of Firefox that crashes or still have a virus problem.
(irrc some Firefox versions specifically had problems after Windows restores)
Follow up checking for malware and then try re-installing Firefox. I would also suggest you make a copy of your [[profiles|profile]] including all folders and sub files and put it somewhere safe as it may assist in restoring your bookmarks and information.
See also
*[[backing up your information]]
* [[is my firefox problem a result of malware]]
* a typical post about malware checks: [/questions/914980#answer-302372]

Firefox will not open; i have a MacBook, osx version 10.8.2

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