Firefox 3.6.11 / 3.6.12 is not being installed / not opening in my Mac 10.6.4 Plz Help.

Firefox 3.6.11 / 3.6.12 is not being installed / not opening in my Mac 10.6.4
Please Help.
- Bhavesh

Firefox 3.6.x versions are still updated with security patches (Firefox 3.6.18 is due in about two weeks).
You are unfortunately out of luck with an Intel Mac and OS X 10.4.11. 
There is a compatible version from for a PowerPC Mac, but no alternative for an Intel Mac.

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An error causes firefox not being able to open last session

Off some reason Firefox wont restore last session. The opportunity in Firefox/Google startsite malfunctions of some reason not giving the possibility to restart last session.

To add to what madperson said, see the [[Session Restore]] article under '''Troubleshooting''' and make sure that your Firefox [[Options window - Privacy panel|privacy settings]] are correct, so that your browsing history is saved. <del>If that's not the problem:</del>
<del>You said "an error". Could you be more specific? Do you see the "Restore previous session" button on the default Firefox home page (shown [https://support.mozilla.org/en-US/kb/restore-previous-session#w_when-you-select-restore-previous-session-from-the-default-home-page here]), which means you had tabs and windows open when you last closed Firefox, but clicking it doesn't work? A possible cause of that is a file in your Firefox [[profiles|profile folder]] is corrupt ([https://bugzilla.mozilla.org/show_bug.cgi?id=682944 bug 682944]). You can open the Firefox profile folder from the "Help -> Troubleshooting Information" page, then close Firefox and delete this file, to see if it helps: '''chromeappstore.sqlite'''</del>
Never mind. I see you solved the problem.

I have a Mac OS X 10.7.5/Firefox 30.0 I always tab browse-now when I click+to open tab it wont open. Updates all current.

I have a Mac OS X 10.7.5/Firefox 30.0 I always tab browse-now when I click+to open tab it wont open. Updates all current.

We have recently seen reports about a Community Toolbar extension causing this issue with not being able to open a new tab.
Your System Details list shows:
*The Great Fun Community Toolbar 3.21.0.1
Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
*Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
*Do NOT click the Reset button on the Safe Mode start window
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

I was updating Firefox from version 6 to version 7, after updating I tried to open Firefox and the message I got is this: This application has failed to start because xul.dll was not found. How can I fix this?

I was updating Firefox to the newest version 7.0.1 from version 6.0.2 I think it was, I clicked the restart Firefox button that always comes up after updating. It started updating and then Firefox never restarted like it was supposed to after it was done updating. I then tried to open Firefox and it told me "This application has failed to start because xul.dll was not found." I did have Firefox crash on maybe about 30 minutes or so earlier which bothered me because I have been using Firefox for years and never had it crash on me before but I didn't think much of it at the time it happened because I was able to go back onto Firefox and finish what I had been working on. A while later I checked for updates and updated. The first time I tried to update it didn't work though so I had to shutdown Firefox and reopen Firefox and start the update a second time. It was after the second time that when I tried to open Firefox I got that message about failing to start because xul.dll can't be found. I filed a crash report when my Firefox crashed. This would have been around 1am-2am in the morning that Firefox first crashed and then wouldn't allow me to open it after updating. I have a DELL laptop running the Windows XP operating system but the laptop is probably at least 6 or 7 years old. The laptop will no longer charge so I always have to have it plugged into an outlet. Both my laptop hard drive and my external hard drive give me messages that I am running out of disk space on my hard drive. I bought this laptop 6 or 7 years ago second hand so it could be even older. In short it's a piece of crap and it gives me all kinds of issues but I currently can't afford a new one, but I have never had any problems with Firefox and I use Firefox more than any other aspect of my laptop so it's really really bothering me. May you please help me fix it?

Unfortunately I tried that and it didn't work. Thanks for the help though. I tried to uninstall and it said I couldn't because the file is corrupt or something, but I think I finally got it uninstalled and/or deleted or whatever, but now I try to reinstall/download it again from the beginning and I can't. No matter what I do I can not get Firefox working again. No matter how many times I try to redownload it. Any other suggestions?

The "Roman" font is not being recognized in Firefox 4.0. As such, I cannot read any previously posted topics or post any new topics on websites using this font.

The "Roman" font is not being recognized in Firefox 4.0. As such, I cannot read any previously posted topics or post any new topics on websites using this font.

I have had a similar problem with my system. I just recently (within a week of this post) built a brand new desktop. I installed Windows 7 64-bit Home and had a clean install, no problems. Using IE downloaded an anti-virus program, and then, because it was the latest version, downloaded and installed Firefox 4.0. As I began to search the internet for other programs to install after about maybe 10-15 minutes my computer crashes. Blank screen (yet monitor was still receiving a signal from computer) and completely frozen (couldn't even change the caps and num lock on keyboard). I thought I perhaps forgot to reboot after an update so I did a manual reboot and it started up fine.
When ever I got on the internet (still using firefox) it would crash after anywhere between 5-15 minutes. Since I've had good experience with FF in the past I thought it must be either the drivers or a hardware problem. So in-between crashes I updated all the drivers. Still had the same problem. Took the computer to a friend who knows more about computers than I do, made sure all the drivers were updated, same problem. We thought that it might be a hardware problem (bad video card, chipset, overheating issues, etc.), but after my friend played around with my computer for a day he found that when he didn't start FF at all it worked fine, even after watching a movie, or going through a playlist on Youtube.
At the time of this posting I'm going to try to uninstall FF 4.0 and download and install FF 3.6.16 which is currently on my laptop and works like a dream. Hopefully that will do the trick, because I love using FF and would hate to have to switch to another browser. Hopefully Mozilla will work out the kinks with FF 4 so I can continue to use it.
I apologize for the lengthy post. Any feedback would be appreciated, but is not necessary. I will try and post back after I try FF 3.16.6.

I'm note a firefox geek, but ever since my friend told me to install NoScript I can not access my msn and hotmail page. It tells me that Java Script is required, what ever that is. What do I do next. Do I uninstall the No Script. Thanks Ed

I'm note a firefox geek, but ever since my friend told me to install NoScript I can not access my msn and hotmail page. It tells me that Java Script is required, what ever that is. What do I do next. Do I uninstall the No Script. Thanks Ed edit
Details

You are on Windows 2000, you do not have a "Firefox" button, and should consider yourself to be fortunate in that you still have menus and don't have to do anything to get the menus back instead of the "Firefox" button. (The same applies to Windows XP users).
Use the "File" menu to get to Import. You are not on Windows 7 or Vista, and don't have to put up with the nonsense added for Aero.
If you want the "Firefox" button you can get it with View -> toolbars -> (uncheck) Menu Bar. The menu bar and the "Firefox" button were supposed to be mutually exclusive (which is impossible in some cases without being incompatible).
Once you are using the "Firefox" button ...
Use the "Alt" key to view the menu bar (temporarily) containing File, Edit, View, History, Bookmarks, Tools, and Help. On Windows 7 and Vista, the menu bar was hidden by default in Firefox 4 and above. These menu items are more or less available under the "Firefox" button which has the most used of the built-in Firefox menu items available in a different format.
To get back to having menus again. "Firefox" button -> Options (second column) -> (check) Menu Bar
You can make '''Firefox 7.0.1''' look like Firefox 3.6.*, see numbered '''items 1-10''' in the following topic [http://dmcritchie.mvps.org/firefox/firefox-problems.htm#fx4interface Fix Firefox 4.0 toolbar user interface, problems (Make Firefox 4.0 thru 8.0, look like 3.6)]. ''Whether or not you make changes, you should be aware of what has changed and what you have to do to use changed or missing features.''
* http://dmcritchie.mvps.org/firefox/firefox-problems.htm#fx4interface

When I click to open firefox it says that "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" and I've tried to shut down and restart my computer but it keeps

when i click to open firefox it says that "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." and I've tried to shut down and restart my computer but it keeps showing the same message. I've even uninstalled Firefox and then reinstalled in the hopes that the problem would be solved but it this message is still popping up. What can I do to solve this problem?
== This happened ==
Just once or twice
== I was on facebook trying to upload pictures yesterday. ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.0.3705; .NET CLR 1.1.4322; Media Center PC 4.0; InfoPath.1)

Do you have a profile lock file in your profile folder? If so, delete it and see if TB runs properly:
http://kb.mozillazine.org/Profile_in_use#Remove_the_profile_lock_file

Since upgrading to Firefox 8.0.1, it is hanging when I try to open it. Deleting profiles etc. doesn't help. I suspect the problem has to do with caching or history, since when I first quit after upgrading I had to force-quit as it was hanging.

'''bold text'''MacOS 10.5.8 is my operating system.
There is no actual crash, thus no crash ID--it just hangs forever and eventually I force-quit.
Restarting the computer hasn't helped
Downgrading to previous versions didn't help.
Deleting profiles and preferences doesn't seem to make any difference.
Apparently clean re-installs hasn't helped.
If option-opening is really safe mode on a Mac, then that isn't helping, either. It's the same hanging.
No problems are being noted with any other software.
I'm totally stumped--what else can I take off for a cleaner re-install?

Firefox hangs the same way in safe mode.
There is no such thing as a Firefox program folder on a Mac, nor is there an "uninstall" to do, so these directions are not relevant to a Mac user.
The problem remains.

When I click on Firefox it opens with a box that says "Foxfire is installing your updates and will start in a few moments-. " then it says "Software Update Failed (in blue) with an exclamation mark inside a yellow triangle) The update could not be install

When I click on Firefox the first time it says "Foxfire is installing your updates and will start in a few moments…. (with a green bar)" then it says "Software Update Failed (in blue) with an exclamation mark inside a yellow triangle)
The update could not be installed. Please make sure there are no other copies of Firefox running on your computer, and then restart Firefox to try again." When I click the ok, Firefox opens up. If I open another Firefox window with the previous one still running, it doesn't give me any of these messages, it just opens normally.
== This happened ==
Every time Firefox opened

If you can't install on top of the current installation then you need to delete or rename the current Firefox program folder to do a clean install.
It is possible that your security software is using or locking files, so you can try to temporarily disable that software during the installation.

An update tries to run, but an error message stating "The update could not be installed. Please make sure there are no other copies of Firefox running on your computer, and then restart Firefox to try again." I can't open Firefox

I click on Firefox and it says that Firefox is installing your updates and will start in a few minutes. Then I get "The update could not be installed. Please make sure there are no other copies of Firefox running on your computer, and then restart Firefox to try again." this cycle never ends. Do I need to deinstall Firefox and re-install? If I do that, do i lose all of my bookmarks, etc?

See http://kb.mozillazine.org/Software_Update (Software Update not working properly)
Remove the files in the updates and updates\0 folder:
*C:\Documents and Settings\<user>\Local Settings\Application Data\Mozilla\Firefox\Mozilla Firefox\updates
*(%USERPROFILE%\Local Settings\Application Data\Mozilla\Firefox\Mozilla Firefox\updates)
*C:\Program Files\Mozilla Firefox\updates
*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. Do not remove personal data when uninstalling.
*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

If Firefox is set as the default browser, and any application attempts to open a new window, this fails and I get the error "Firefox is already running..."

Here is what I am running:
Microsoft Windows 7, Service Pack 1, Fully updated to 4/10/2012
Fresh Install of Firefox 11. No add-ons enabled as a result of troubleshooting.
I am a user with administrator rights
UAS is disabled.
To begin, this has been going on Since Firefox 10 or so. A few months now.
I am able to open Firefox. My add-ons worked (ABP, Flashblock, ABP Element Hiding Helper, IETAB2, Downthemall, Greasemonkey, 4chan extension) had no problems. Firefox is set and has been set for the last two years as my default web browser.
However Since approximately Firefox 10 or so, maybe before that, If I have a Firefox session open, and any other application attempts to open a session in a new window, I get the Firefox is already running, but not responding error."
I attempted to follow troubleshooting advice already posted (look for parent.lock files left behind [none present], multiple sessionstore.js files [none present], create a new user profile, attempted to clear out the "read-only" permission in windows 7, however as soon as it is cleared, the read only permission returns.)
As a last resort, I deleted the Firefox folder, the %APPDATA%/Mozilla directory in its entirety, then utilized CCleaner to remove any and all references to Firefox in the windows registry, then did a full re-install, no extensions installed right now.
I checked preferences and have the option "open new windows in a new tab" checked off. The problem persists regardless if this option is checked on or off. This problem persists in or out of safe mode, even with the brand new install.
Test Cases:
All cases:
Firefox is selected as the default browser for windows 7
Case 1: Open a firefox session. Utilize any other program that attempts to open a link to their website in a new browser window or new browser session. Experience "Firefox is already running" error
Case 2: Open a firefox session. Right click on Firefox on the task bar. Select "open in new window". Experience "Firefox is already running" error
Case 3: Open a firefox session. Select the Firefox Menu > New tab > New Window. A new window will actually open.
This is the only method of opening a new window in the same browser session or profile that actually works on my system. Attempting to open a browser session from the task bar "open new window dialog" or opening a new window while a current window/session is running will not open firefox in a new window or a new tab in the current session. The "Firefox is already running, but is not responding" error will occur every time.

Cor-el's suggestion resolved my problem. Apparently the MOZ_NO_REMOTE variable was set to 1 on my system variables. I never made it, and really have no idea how it got there, but deleting this variable and restarting firefox has resolved the issue. Thanks Cor-el!
Marking case: Solved
Solution: Verify the MOZ_NO_REMOTE variable is NOT set to 1. This can be achieved by simply deleting this variable.

Firefox doesn't open, but is open in Processes in Task Manager, not even profile manager opens up for Firefox opens up. Please help

I'm using Vista, 32 bit - not even downloading the beta version of Firefox 4 helps; it downloads (just like the regular version of Firefox, 3.4) and I can install it, but trying to run it gives me nothing - no warning, no text; it just doesn't open up, but is still visible in my start menu, programs folder and in task manager. And not even profile manager opens up.

Make sure that you do not remove your personal data when you uninstall Firefox. Then you won't lose personal data stored in a different location in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder].
See also http://kb.mozillazine.org/Profile_backup and [[Backing up your information]]
A possible cause is security software (firewall) that blocks Firefox. 
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. 
See [[Server not found]] and [[Firewalls]] and http://kb.mozillazine.org/Firewalls
See also http://kb.mozillazine.org/Browser_will_not_start_up
Do a malware check with a few malware scan programs. 
You need to use all programs because each detects different malware. 
Make sure that you update each program to get the latest version of the database. 
*http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
*http://www.superantispyware.com/ - SuperAntispyware
*http://www.safer-networking.org/en/index.html - Spybot Search & Destroy
*http://www.lavasoft.com/products/ad_aware_free.php - Ad-Aware Free
*http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
See also "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked and [[Searches are redirected to another site]]

Had to uninstall Firefox, now I can't reinstall. Get error message "Can not find archive file." Please help!

I believe I had some kind of virus attack. I got everything cleaned up. (I HOPE) In the process of cleaning the virus, I unintalled Firefox because it wouldn't open. Kept getting the error message that Firefox was already open and I had to close out of the sessions or restart the computer. After restarting the computer several times and not being able to find any open sessions in task manager, I uninstalled. When trying to reinstall, I get the error message "can not find archive file." I've tried downloading Firefox from cnet as well as the Mozilla site to no avail. Please help. I'm getting tired of using Chrome already!

Hello,
Certain Firefox problems can be solved by performing a ''Clean reinstall''. This means you remove Firefox program files and then reinstall Firefox. Please follow these steps:
'''Note:''' You might want to print these steps or view them in another browser.
#Download the latest Desktop version of Firefox from http://www.mozilla.org and save the setup file to your computer.
#After the download finishes, close all Firefox windows (click Exit from the Firefox or File menu).
#Delete the Firefox installation folder, which is located in one of these locations, by default:
#*'''Windows:'''
#**C:\Program Files\Mozilla Firefox
#**C:\Program Files (x86)\Mozilla Firefox
#*'''Mac:''' Delete Firefox from the Applications folder.
#*'''Linux:''' If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see [[Installing Firefox on Linux]]. If you downloaded and installed the binary package from the [http://www.mozilla.org/firefox#desktop Firefox download page], simply remove the folder ''firefox'' in your home directory.
#Now, go ahead and reinstall Firefox:
##Double-click the downloaded installation file and go through the steps of the installation wizard.
##Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.
Please report back to see if this helped you!
Thank you.

I close firefox and try to open it again later, it WON'T and says, "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." Firefox isn't running .

After I turn on my laptop and click on firefox it works fine and it opens THE FIRST TIME. So can you help? i DON'T WANT TO RESTaRT my computer everytime and sometimes have to clsoe firefox b/c I'm typing paper and computer goes slow.

Sounds like a "hang at exit" problem. There are several possible causes for that error. See:
* How to stop the running Firefox process
** In Task Manager, does firefox.exe show in the '''Processes''' tab?
** See: http://kb.mozillazine.org/Kill_application
* What may cause Firefox to hang at exit
** http://support.mozilla.com/en-US/kb/Firefox+hangs (see "Hang at exit" section)
** http://kb.mozillazine.org/Firefox_hangs
** https://support.mozilla.com/en-US/kb/Firefox+is+already+running+but+is+not+responding
* You may need to try Firefox Safe Mode
** You may need to use '''Safe Mode''' to locate the problem: http://support.mozilla.com/en-US/kb/Safe+Mode
**Firefox Safe Mode is a diagnostic mode that disables Extensions and some other features of Firefox. If you are using a theme, switch to the DEFAULT theme: Tools > Add-ons > Themes '''before''' starting Safe Mode. When entering Safe Mode, do not check any items on the entry window, just click "Continue in Safe Mode". Test to see if the problem you are experiencing is corrected.
** If the problem does not occur in Safe-mode then disable all of your Extensions and Plug-ins and then try to find which is causing it by enabling '''one at a time''' until the problem reappears. '''You MUST close and restart Firefox after EACH change''' via File > Restart Firefox (on Mac: Firefox > Quit). You can use "Disable all add-ons" on the Safe mode start window.
** See the following for more information
*** http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes
*** http://support.mozilla.com/en-US/kb/Troubleshooting+plugins
*** http://support.mozilla.com/en-US/kb/Basic+Troubleshooting

When I try to start Firefox, I get a message that it is already running but not responding and I can't run another Firefox at the same time. I uninstalled and reinstalled. No change. Tried various other suggestions. Help!!

When I try to start Firefox, I get a message that it is already running, but not responding and that I should close it before trying to run another Firefox. But I cannot find a way to close Firefox program that is not running as far as I can see. I tried uninstalling and reinstalling Firefox, but that did not work. I've tried various other things, but no luck. I thought programs should stop when the computer is turned off, but that didn't work either.

How are you opening the Profile Manager?
*http://kb.mozillazine.org/Profile_Manager
Sounds that Firefox is still or already running. 
See:
*http://kb.mozillazine.org/Kill_application

Firefox 3.6.11 / 3.6.12 is not being installed / not opening in my Mac 10.6.4 Plz Help.

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