Firefox won't open when prompted the first time. Says "Not Responding". I have to hit cntrl/alt/del then try starting again. Sometimes multiple times.

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

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Firefox won't open/connect tp the internet. Explorer opens and connects. Windows firewall turned off. No other antivirus program running. Happened when I downloaded new Firefox update.

Firefox won't open/connect tp the internet. Explorer opens and connects. Windows firewall turned off. No other antivirus program running. Happened when I downloaded new Firefox update.

I had the same problem when i dl-ed a new anti-virus softward, but what I did help me reconnect Firefox again!
Here is what I did,
Go to open firefox browser-->option-->advanced-->network-->settings-->and change it to auto-detect proxy settings for this network!
It worked for you, hope it will work for you too =)!
Cheers

Firefox won't open when I click on the icon. I've tried uninstalling so that I can reinstall, but it says I have to close firefox (which isn't open), so I'm stuck.

The problem: Firefox won't open when I click on the program.
Solutions tried: #1) I tried to uninstall the program so that I can download it again, but the screen shows the message "firefox must be clsoed.. to proceed with installation". However, firefox is not open.
#2) I tried to download firefox, thinking that possibly it would update and solve the problem. However, I get the same error message that "firefox must be clsoed.. to proceed with installation" Problem is that firefox is not open.
I've done a screen shot, so you can see that I do not have the firefox browser open.

Thanks for the reply. I tried repairing the permissions (as well as several other things like deleting the Finder preferences file), but no dice.
Given that the problem cropped up right after updating OS X on two separate machines, it's looking to me like it's just a bug that needs squashing at this point.

After opening my yahoo mail window, I keep getting a very narrow dialogue box with the words "log into Xmarks" I cannot ... and everything is frozen. How can I get rid of this thing, and what is it? I have to hit CNTRL + ALT + ESC to get rid of it.

After opening my yahoo mail window, I keep getting a very short and narrow dialogue box with the words "log into Xmarks" I cannot ... when it pops up, always upper left of my laptop screen and I try to get into my yahoo mail web page, I get a DING sound and cannot enter it ... everything is frozen. I have to hit CNTRL + ALT + ESC to get rid of it - and then reload my Firefox browser to get back to my yahoo e-mail page ... fortunately for me, Firefox re-stores a previous session ... How can I get rid of this intrusive thing, and what is it? Thanks in advance ... Ted Beaudoin, Welland, ON, Canada

Remove VideoFileDownload and find a downloader that doesn't contain TextEnhance.

Firefox won't open when clicked in the dock on my Mac

Mac Snow Leopard v. 10.6.8, Firefox icon in dock, won't open when clicked

As a point of clarification, does Firefox launch if you double click it from your Applications folder through the desktop (Finder)? If yes, right click (or Ctrl-click) on the Firefox icon in your Dock and choose Remove From Dock, then drag it on again from your Applications folder. The only other thing I can think is if it's already running but with its window hidden, clicking it again in the Dock might not be bringing it up. In that case try a Force Quit (from the Apple menu at top-left of your screen, click Force Quit..., choose Firefox in the list and click the Force Quit button).

When composing a new message with Thunderbird, the program freezes & says "not responding"

Recently, I needed to reset my 'Main work Computer' to factory default. Before I wiped everything I saved all the messages addresses etc via Mozback, I then transferred all the info to the laptop to see if it works, which it does.
After this I re-installed Thunderbird to my recently reset computer, I used Mozback up to restore all the information as set like it was previously.
It was working great for about a day then only recently I came across this problem:
Thunderbird still receives mail & I can read it, however when I try 'compose new message', 'reply' or 'forward' a message the new box will open up ready to type into except it freezes & it says not responding.
I have it on my laptop & its working fine for now but I'm wanting it to work on the Main Computer!!
What should I do??

I've figured it out!!! Because I had only just reset the computer to factory default, I decided to reset it again & follow my steps to see what may of happened.
I installed all programs including Thunderbird & it was all working fine...
Until I decided to load a whole heap of fonts into the System. This is where something went wrong with Thunderbird & would freeze when composing a message. So I deleted the fonts I had just installed & it worked again... Now I only load fonts one at a time when I need to. (I am a sign designer, we need fonts!!)

Firefox won't open when clicked on

It does the windows loading symbol and then doesn't open. Only just installed it as I'm currently using google chrome and it won't let me open it.

Hi cats4lyfgee,
I am sorry to hear that Firefox will not start when you click on it. [[Firefox takes a long time to start up]]
If not, please make a back up of your profile to preserve data: [[Back up and restore information in Firefox profiles]]
ote:''' 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.
More information about reinstalling Firefox can be found [[Troubleshoot and diagnose Firefox problems#w_5-reinstall-firefox|here]].
WARNING:Do not use a third party uninstaller as part of this process. Doing so could permanently delete your [[Profiles|Firefox profile]] data, including but not limited to, extensions, cache, cookies, bookmarks, personal settings and saved passwords. These cannot be easily recovered unless they have been backed up to an external device! See [[Back up and restore information in Firefox profiles]]. 
Please report back to say if this helped you!
Thank you.

I have been running Firefox on my PowerPC G5 for years and have just tried to install 4.0. When I attempt to start Firefox, a window opens telling me the application cannot be launched. I have installed it twice with the same result. What gives?

I have a PowerPC G5 quad core Mac with a pre-intel chip. I have been running Firefox successfully for over five years and have used every version in operation during that time. Tonight, I received notice that the latest version of 3.6 was ready to install and that I needed to restart. I did that and was taken to a page telling me that 4.0 was available for downloading and use. So I downloaded the new 4.0 and tried to install it in the typical Mac fashion. After clicking on the dmg, I dragged the icon into my applications folder and onto the dock. But when I click on the icon on the dock, I get the message: The application cannot be launched. 10661
When I try to launch by double clicking in the applications folder, I get the message: You cannot open the application Firefox because it is not supported on this system.
I had to go to your site using Safari of all things! I tried re-installing it with another download, and that one misbehaves in the same way. By the way, in case it matters, I still have 42 GB available on my hard drive and 5 GB of RAM.
There is one other funny thing. The Firefox icon from the disk image has a white circle with the slash through it on top of the fox and world symbol. That is what appears in my applications folder and in my dock. It appears to be saying NOT FIREFOX, as it would indicate in a NO U-TURN sign. What is this all about?

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.

Firefox won't open when I click on it.

I click on both the icon in the dock and in the apps folder. When I click on the icon in the dock it bounces a couple of times and then nothing, it doesn't open and no white dot appears like they do on open apps in the dock. I am running the latest Mac OS. After having this happen I updated my software and downloaded at new version of Firefox off the web but the same thing happens. I have not downloaded anything in the last week and have been using firefox up until today.

okay I threw away my profile for firefox in library/application support/firefox and now it opens, a corrupt file apparently. Sorry for my tardy reply, sounds like you may have solved it, but I figured this might help someone else.

Firefox won't open; I get the msg. "Cannot open file or DLL C:\WINDOWS\system32\USP10.dll - what's up?

I've tried uninstalling Firefox, re-downloading it (various versions and sites), and re-installing; I just get the same reference to
"USP10.dll" in directory C:\WINDOWS\ system32 ...
so wha' happen?
I don't think I did anything (install or whatever) before this happened
Thanks for any suggestion.

But I can't... find... it... It's not there.
Unless you're talking about the entire Mozilla Firefox folder (which isn't what the thing you copied says,) there is no installation folder.

Firefox won't open external links (from other programs), says its already running but not responding.

I'm having this problem, everytime i click a link on other program, like the program's link on the about tab, or a youtube link on Live Messenger, it won't open, a dialog pops up saying firefox is already running and not responding, but it is there, and working.
If it matters, i have the "beta" tab preview enabled on the windows 7 toolbar.

You're welcome

Firefox won't open (in a new session) from email link. I have this issue on my Win 7 and XP computers.

If I open my email account (TBird) w/out opening Firefox, and then try to open a link from the email, Firefox will not open. I can't then go and open it from the desktop either. I used to go to Task Manager and close the .exe file," but MS has changed that so that I can't get into the "process" area. How do I fix this?

Although 6 other people seem to have encountered this problem, nobody has offered a solution yet. Perhaps the following will put some Firefox gurus on the right trail.
When I said "my search results", I meant the results obtained with Google (standard when installing Firefox). Now I have tried another search engine (Dogpile) and there The tabs do work. Very strange, isn't it ?

When I open browswer it say error . I have to lock down my computer then resign in again once I do that everything is fine. If I happen to leave the browswer and want to get back on I have to relock my computer and resign in again.....

The browser will not go on line it says that there is an error ...

Try SMC reset:
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time. (four keys together)
Release all the keys and the power button at the same time.
Press the power button to turn on the computer.

I cant force quiet or relaunch the finder. it says"not responding". Although other apps are running just fine. I've tried restart several times/force shut down several time. I am using a mac book pro retina, Mavericks 10.9.5.Nothing works. Any idea??

How do i quiet finder?i can't force quiet or relaunch finder. it says' "finder not responding". Therefore I couldn't shut down. I've tried to force shut down & restart several times. but still finder won't quiet. Any idea please???? I am using a macbook pro retina with Mavericks 10.9.5.

Go to Finder and select your user/home folder. With that Finder window as the front window, either select Finder/View/Show View options or go command - J. When the View options opens, check ’Show Library Folder’. That should make your user library folder visible in your user/home folder. Select Library. Then go to Preferences/
com.apple.finder.plist. Move the .plist to your desktop.
Re-launch Finder by restarting and test. If it works okay, delete the plist from the desktop.
If the same, return the .plist to where you got it from, overwriting the newer one.
Thanks to leonie for some information contained in this.

My Firefox won't open when I double click it. 16.0.2

Okay, so I got this new computer (Gateway) on Friday, and Sunday Firefox decides to not work. I have been un-installing and re-installing Firefox. I have done this like 20 times. Didn't help. I also have tried pressing 'shift' while double clicking on the icon for Firefox, didn't work either!! I'm currently using Explorer (not crazy about.. but will have to deal until this gets solved). I have also tried this link:
http://www.mozilla.com/en-US/firefox/all.html. Did not work either.
Please help me!!!

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 (16.0.1 to 16.0.2).
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
See also:
*http://kb.mozillazine.org/Browser_will_not_start_up
*http://kb.mozillazine.org/Error_loading_websites

Firefox won't open when prompted the first time. Says "Not Responding". I have to hit cntrl/alt/del then try starting again. Sometimes multiple times.

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