Firefox is not launched from thunderbird and endnote URL

I used to be able to click on a link from Thunderbird and Firefox could be opened, but now it doesn't do anything. Also, when I click on a URL from Endnote, Firefox doesn't open.

First thing to check: is Firefox set as your default browser.
# Go to Tools > '''Options'''
# Click the '''Advanced''' panel
# Click on '''General''' tab
You will find at right bottom a button '''Check now''', click it. A little window will tell you if Firefox is default, then choose.
Restart Thunderbird and test a link.

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Upgraded to 7.0.1 and then Firefox would not launch.

Upgraded to 7.0.1 last night. Firefox would not launch afterward. Hour glass appears for a few seconds then goes away. I can see on Task Manager that Firefox.exe appears in the Proceses list and then after a few seconds disappears. No browser, no error message. After going through every troubleshooting step I could find I removed 7.0.1, downloaded 3.6.23 from Firefox site and this works fine.

Very strange. So today I log in to my banking site and everything is working properly. Firefox tells me I am running the same version 8.0.1. Who knows! I guess I should just be happy that Firefox works as it should.

Firefox does not save my tabs and windows from last time when I start it although i have already set it so (on Macbook)

Firefox does not save my tabs and windows from last time, although i have already set it so (on a Macbook) (newest version)

If you use [[Clear Recent History]] in Firefox 3.5 and later to clear the 'Browsing History' when you close Firefox then restoring tabs from the last session ("Save & Quit" or "Show my windows and tabs from last time") doesn't work.

Firefox will not launch, but shows in task manager, after updating graphics drivers to AMD's 13.1.

Hi,
After updating to the AMD 13.1 drivers, on my 5770, Firefox will not launch; it does, however, show in the task manager. I should note that it will start in Windows safe mode; when I had it open in safe mode, I used that time to disable all plugins, add-ons, extensions, and created a new profile. This did not help. I also tried launching Firefox in to its safe mode, and had no luck with this either.
I experienced this problem once before, when trying to update to a previous version. I believe I was moving from 12.1 to 12.4, but I'm not 100% sure of that. Ultimately, my solution then was to retrograde back to my previous driver. The steps mentioned in the previous paragraph did not help at that time, not did a complete reinstall.
15 years of computer repair experience, and this has me baffled.
Thank you to anyone who might be able to help.
Possibly relevant specs.
Windows 7 Ultimate x64
AMD Phenom II x4
6BG Ram
AMD 5770 graphics, running Catalyst 13.1

By any chance, did you disable Firefox's use of hardware graphics acceleration? To avoid a round-trip through Windows Safe Mode, you could try adding these to your prefs.js file while Firefox is closed.
To quickly open the folder with the correct prefs.js file, you can use
Help > Troubleshooting Information > "Show Folder" button
Because Firefox may overwrite change to this file at shutdown, you should edit it after closing Firefox and allowing a few moments for Firefox to finish updates to the files.
These are the preferences I think are most relevant:
user_pref("gfx.content.azure.enabled", false);
user_pref("gfx.direct2d.disabled", true);
Does that make any difference?

Firefox will not launch

firefox will not launch after upgrading. Every time I try to launch I am advised to reboot to complete the upgrade.

I think you already known that latest firefox version 13.0.x don't work with xp sp1, needs sp2 and above.
Try [https://support.mozilla.org/en-US/kb/uninstall-firefox-from-your-computer Uninstall Firefox from your computer]
then Download the latest version(with your safari) from :
http://www.mozilla.org/en-US/firefox/all.html
and Install the version that you have downloaded (13.0.1).
Do not select to remove your personal data, your profile data is stored elsewhere in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder], so you won't lose your bookmarks or other personal data.
see also for info : [https://support.mozilla.org/en-US/kb/install-firefox-windows Install Firefox on Windows]
thank you
Please mark "Solved" the answer that really solve the problem, to help others with a similar problem.

Firefox did not launch. I downloaded new one. the icon is crossed out. how can I fix this?

March 25 2011
I'm on a Mac OS X (power pc)
After restarting my computer today. Firefox did not launch. I clicked on the icon, it started to initiate and then stopped before anything happened.
To try to fix the problem, I trashed the application and downloaded a new one. It gave me a message: "The application Firefox cannot be launched -10661."
I retried the download and the second time, the Firefox application icon has been crossed out. That is it has a circle with a slash over it. Same message comes up.

Sorry, Firefox 4 is not available for PowerPC Macs. You can re-install the previous version from here:
http://www.firefox.com/all-older.html
Or you can find an unofficial version of Firefox 4 for PowerPC here: http://www.floodgap.com/software/tenfourfox/

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It seems that many people have experienced this problem. Most have solved it by signing out from the creative cloud desktop application and signing back in. Here are instructions on how to do it:
Sign in, Sign out | Creative Cloud desktop app

Firefox will not launch after latest OS X security update

Just installed latest Apple software update on Snow Leopard. Now, Firefox will not launch. Checked system logs and get this:
11/21/10 10:24:20 PM com.apple.launchd.peruser.501[155] ([0x0-0x6d06d].org.mozilla.firefox[802]) Exited with exit code: 1
The following may or may not be related. Before installing the update, I had lots of these messages in my logs:
11/21/10 7:27:17 PM firefox-bin[39594] *** __NSAutoreleaseNoPool(): Object 0x1422680 of class __NSCFDate autoreleased with no pool in place - just leaking
11/21/10 7:27:17 PM [0x0-0x493493].org.mozilla.firefox 2010-11-21 19:27:17.323 firefox-bin[39594:903] *** __NSAutoreleaseNoPool(): Object 0x1422680 of class __NSCFDate autoreleased with no pool in place - just leaking

Sounds like you may have a check in the box for HTTP and/or HTTPS proxy servers, but you are not behind a proxy server. Safari and Software Update use the HTTP port, Mail doesn't, and Firefox ignores the Mac OS preferences and uses it's own proxy settings.
Go to System Preferences > Network > active connection > Proxies tab and if there are proxies checked, UNcheck them.
Hope this helps...

Firefox is not launching again

MY FIREFOX IS NOT LAUNCHING..I MEAN IT CAN NOT START. I HAVE INSTALLED IT MANY TIMES, YET IT CAN NOT START. I HAVE UNINSTALLED IT MANY TIMES, YET THE PROBLEM PERSISTS. PLEASE WHAT DO I LACK IN MY PC THAT MADE FIREFOX NOT LAUNCH? I AM USING HP 530 LAPTOP WITH WINDOWS XP.
AND I HAVE ENJOYED USING FIREFOX FOR LONG AND I LOVE USING FIREFOX AND ALL ITS FEATURED PRODUCTS. BUT I CANT LAUNCH IT AGAIN. PLEASE HELP ME.

Are you talking about a web link short cut, or the icon to launch Firefox?

Firefox will not open some sites and does not function on those opened

Firefox does not open comcast.net and fails to respond on other websites. It opens others but does not function once opened.
== URL of affected sites ==
http://
== User Agent ==
Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.86 Safari/533.4

I am an ordinary user and use FireFox on a Windows XP pro sp2 OS.
I can open and run FireFox by a variety of methods, and do not need to have any firefox: folders, files, or shortcuts on my Desktop unless I so wish.
I suspect you have a rather none standard installation. The quickest solution may well be to uninstall FireFox ( which you have presumably not been able to use anyway) and reinstall it. I would suggest; at least initially; you just use the standard default installation you are offered.
You will probably find this page of use, the [http://www.mozilla-europe.org/en/firefox/3.6.13/releasenotes/ Release Notes], it includes links for downloading FireFox, and has advice and information about installing and downloading.
I am sure you will have further questions when you try to install but click on the blue link above and look at that page and then post back again and I am sure someone will try to help you.
I am assuming that you are already on the Internet with a browser such as Internet Explorer, and a broadband connection, or are you trying to install from a CD or something that has a FireFox install file on it. (if so what are you using, and what is the version of firefox)

Firefox is not loading the requests and invites on the right side of the Facebook home page. AOL is loading everything correctly.

Firefox in not loading the "requests and invites" on the right side of the Facebook Home Page. I don't think it is a Facebook problem because AOL loads it correctly. This is the third day I have had this problem. I don't like to use AOL because it is much slower. Please help.
== This happened ==
Every time Firefox opened
== I opened Facebook three days ago

"Clear the Cache": Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"
"Remove the Cookies" from sites that cause problems: Tools > Options > Privacy > Cookies: "Show Cookies"
Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]]

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How do I delete a movie (not bought from iTunes) and have it actually deleted from the library as well?

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If iTunes absolutely refuses to get rid of the file (I have never heard of this by the way) you can always go to the media folder or wherever the file is located and drag it to the trash yourself.

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I'm having a very similar issue, paired with iTunes not being able to get online.
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Firefox is not launched from thunderbird and endnote URL

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