Firefox process will not end once i close the application.,i have to manually end it,so that i can run the application again.

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.
== This happened ==
Every time Firefox opened
== after 2 weeks of installing ==
== User Agent ==
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.125 Safari/533.4

I un-installed the add-on Ask.com and my problems seems to be solved.

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is it up to date
Speed Dial :: Add-ons for Firefox
"Works with:
Mobile 0.7 - 1.0.*
SeaMonkey 2.0 - 2.5a1
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https://addons.mozilla.org/firefox/addon/speed-dial/#detail-relnotes

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Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
* Don't make any changes on the Safe mode start window.
See:
* [[Troubleshooting extensions and themes]]
* [[Troubleshooting plugins]]
If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
* Use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.
* Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

Firefox process will not terminate on exit

After closing the Firefox browser, the firefox.exe process continues to run and must be closed via Task Manager before Firefox can be restarted or any other application initiated. The process will continue to run for more than a half hour, consuming 100% of CPU cycles and 250 to 450MB RAM without ever terminating on its own. (I didn't have the patience to see if it would continue to eat CPU cycles for a hour or longer.) This problem has persisted for YEARS, through successive updates. I have read all the proposed solution procedures in Support and in Mozillazine, but none of them work since none addresses the cause. I am presently running Firefox 26.0 but wanted to fix this problem before upgrading again.
I have two profiles, "fat" and "slim"; their primary difference is that "slim" has NO bookmarks or sites history. I removed all plugins (disabled and uninstalled); then I disabled all extensions (listed below). Then I enabled the extensions one at a time, restarting Firefox "slim" profile after each; Task Manager verified that the firefox process was NOT still running and the browser restarted without problem. The "slim" profile with all extensions enabled closes and restarts without problems.
I followed the same procedure for the "fat" profile. However, even with all plugins removed and all extensions disabled, the firefox.exe process invoked by the "fat" profile would not terminate on exit and would prevent Firefox from restarting until the process had been killed in Task Manager. Then I removed from the "fat" profile five large sqlite database and other files:
bookmarks.html 23,945 KB
places.sqlite 26,896 KB
session.rdf 10,585 KB
session-1.rdf 3,152 KB
urlclassifier.sqlite 44,684 KB
Of course, Firefox recreates these, but the new versions are empty with minimal size. Now the "fat" profile with all extensions enabled exited as expected and the process terminated by itself. But when I replaced the original, large files back into the "fat" profile, the problem returned: the process would not terminate, consumed 100% of CPU cycles, held 1/2GB of RAM, and would not restart or allow another program to start.
So, if you have verified your extensions and plugins, but experience this behavior, check especially your bookmarks.html, places.sqlite, and urlclassifier.splite files. The larger these files are, the longer Firefox will take to close down in an orderly manner. Closing Firefox, and then opening Task Manager to kill the firefox.exe process is a STUPID procedure to force onto users because bad code gets caught thrashing or lost in the profile's large files.
Now my questions: (1) Is Mozilla working on this problem--Firefox choking the CPU while it's stuck interminably "processing" the large profile files? (2) Are the only current practical solutions to erase or not even to accumulate such histories?
SYSTEM INFORMATION:
system -- Thinkpad T43p Pentium M (single core)
RAM -- 2GB
operating system -- Windows 7 SP1
browser -- Firefox 26.0
extensions --
avast! Online Security 9.0.2013.75
NoScript 2.6.8.18rc1
Adblock Plus 2.5.1
Adblock Plus Pop-up Addon 0.9.1
Element Hiding Helper for Adblock Plus 1.2.3
DoNotTrackMe: Online Privacy Protection 3.1.1038
HTTPS-Everywhere 3.4.5
HTTPS Finder 0.85
BetterPrivacy 1.68
Foundstone HTML5 Local Storage Explorer 1.1
FlashGot 1.5.5.97
Tab Mix Plus 0.4.1.3.1
User Agent Switcher 9.7.2
Aardvark 3.0
Mozilla Archive Format 3.0.0
Re-pagination 2011.5.15
Show my Password 2.0
Saved Password Editor 2.7.2
SQLite Manager 0.8.1

OK, that does it.
This has been going on for a long time. As fine as the Mozilla team is, they don't seem to be fixing it for one reason or another. I'm on v30 and it still persists.
I've decided to stop waiting for them and do something about it myself. I've built a small executable stub that first kills any stale Firefox instances, and then starts up a clean one.
You can download the program and/or Visual Basic source code here:
[https://firefoxkiller.codeplex.com/ Firefox Killer]
If you run into any trouble, post a question in the Discussions section. Be patient; I'm pretty busy. I'll try to respond as quickly as I can.
Thanks,
Jeff Bowman
Fairbanks, Alaska
(Spam Link removed by mod)

Firefox will not start and Firefox.exe process will not end!

Good evening,
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See [/forum/1/725968]
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Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

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See "Firefox hangs when you quit it":
*https://support.mozilla.org/kb/Firefox+hangs
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See "Hang at exit":
* http://kb.mozillazine.org/Firefox_hangs
* [[Firefox hangs]]

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Firefox process will not end once i close the application.,i have to manually end it,so that i can run the application again.

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