After opening a certain website, I can't close firefox anymore

I opened a website in google and I got a tiny webpage saying: This page on http://protectremovevirusxpnow.com says: Windows Security has found critical process activity on your system and will perform fast scan of system files. The only button you can press is OK. I have no windows running on my MAC. Also the tabs are gone, except the tab Firefox. But you can't close firefox. The only thing I can do is to shutdown the whole computer by the powerbutton. What can I do?
Thanks,

Hi sierui,
I have the same problem. Don't know what to do though so not entirely helpful there! But I found the same issue on this thread - https://support.mozilla.com/is/questions/811477 - although none of the answers are particularly useful for mac users, there might be a slight chance that someone will resolve the problem in the near future.
Also, after rebooting my mac, it seems the pop up window with the message 'Windows Security has found ........' didn't pop again.

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williec wrote:
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As I asked previously are you able to have tabs open as a window by using the right clicking option ?
When you close Firefox you should use
*'''Firefox button -> File -> Exit '''
Are you doing that ?
I suspect what may be happening is Firefox is hanging as it closes down.
* see [[Firefox hangs or is not responding - How to fix#w_firefox-hangs-when-you-quit-it]]_firefox-hangs-when-you-quit-it
* this explains how to check & if necessary kill the process [["Firefox is already running but is not responding" error message - How to fix it#w_end-firefox-processes]]_end-firefox-processes
A related possible problem is that you may have built up many copies of the restore files. These are stored in the Firefox profile. The easiest method of finding the profile location istouse
*use '''Firefox button -> Help -> Troubleshooting Information -> [Show Folder]'''
*see [[Profiles - Where Firefox stores your bookmarks, passwords and other user data]]
You need to look for the files ''sessionstore.js'' and numbered duplicates of that. Delete them.
* see http://kb.mozillazine.org/Firefox_hangs#Multiple_sessionstore.js_files

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Hi,
I don't know of a preference, but have you used ⌘-T in iCal?
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I know how to set my homepage for when opening firefox, but I can't find how to make newly opened tabs automatically load my homepage. Can this be done? Seems like opening a new tab only allows a blank page to load.

'''''NewTabURL''''': https://addons.mozilla.org/en-US/firefox/addon/newtaburl/
 
 
'''You need to update the following.''' The Plugin version(s) shown below was/were submitted with your question and is/are out of date. You should update to avoid known security issues with the version(s) you have installed. Click on "More system info..." to the right of your question to see what was included with your question.
*Adobe PDF Plug-In For Firefox and Netscape "9.4.2"
*Shockwave Flash 10.1 r85
*Next Generation Java Plug-in 1.6.0_24 for Mozilla browsers
#'''''Check your plugin versions''''' on either of the following links':
#*http://www.mozilla.com/en-US/plugincheck/
#*https://www-trunk.stage.mozilla.com/en-US/plugincheck/
#*'''Note: plugin check page does not have information on all plugin versions'''
#*There are plugin specific testing links available from this page:
#**http://kb.mozillazine.org/Testing_plugins
#'''Update Adobe Reader (PDF plugin):'''
#*From within your existing Adobe Reader ('''if you have it already installed'''):
#**Open the Adobe Reader program from your Programs list
#**Click Help > Check for Updates
#**Follow the prompts for updating
#**If this method works for you, skip the "Download complete installer" section below and proceed to "After the installation" below
#*Download complete installer ('''if you do NOT have Adobe Reader installed'''):
#**SAVE the installer to your hard drive (save to your Desktop so that you can find it after the download). Exit/Close Firefox. Run the installer you just downloaded.
#**Use either of the links below:
#***https://support.mozilla.com/en-US/kb/Using+the+Adobe+Reader+plugin+with+Firefox ''(click on "Installing and updating Adobe Reader")''
#***''Also see Download link''': http://get.adobe.com/reader/otherversions/
#*After the installation, start Firefox and check your version again.
#'''Update the [[Managing the Flash plugin|Flash]] plugin''' to the latest version.
#*Download and SAVE to your Desktop so you can find the installer later
#*If you do not have the current version, click on the "Player Download Center" link on the "'''Download and information'''" or "'''Download Manual installers'''" below
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#*Click on the installer you just downloaded and install
#**Windows 7 and Vista: may need to right-click the installer and choose "Run as Administrator"
#*Start Firefox and check your version again or test the installation by going back to the download link below
#*'''Download and information''': http://www.adobe.com/software/flash/about/
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#**Use IE to go to the above site to update the IE ActiveX
#*'''Download Manual installers'''.
#**http://kb2.adobe.com/cps/191/tn_19166.html#main_ManualInstaller
#**Note separate links for:
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#***ActiveX for IE
#'''Update the [[Java]] plugin''' to the latest version.
#*Download site: http://www.oracle.com/technetwork/java/javase/downloads/index.html (Java Platform: Download JRE)
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When I open a bookmark a box pops up that says "What should firefox do with this file? "open with Internet Explorer? When I browse I can't find firefox to change to. Last week this book mark worked perfectly.

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]]
If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
You can use "Disable all add-ons" on the ''Safe mode'' start window.
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Can't close Firefox after eradicating Fake.Trojan virus

Got infected with Fake.Trojan virus today while surfing email via Firefox. Successfully used Malwarebytes to clean up the mess but some carnage remains. On a WIn7 platform.
During infection and since eradication I keep getting 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."
Tried the following to no avail --
1. Task Manager - The Firefox process doesn't show up.
2. Restarting the PC - Same problem;
3. Uninstalling & Reinstalling - Same problem; says it need to close first.
4. Finding/fixing the Profile - %APPDATA%\Mozilla\Firefox\Profiles\ not found.
5. Call to tech support at AVG - They've never seen this. They recommend a full reinstall of Windows (Ugh - don't even know where the disks are!).
Any help welcome. Thanks. -j philly

Thank you for the tip. I had already tried your suggestion but based on it decided to take a closer look. I also did a YouTube lookup using IE.
But my first stop was to run that lengthy ChkDsk program to make sure all was structurally sound after the virus. I also bought the Pro version of Malwarebytes to take security even higher.
I went to YouTube because I was having a hard time finding that profile folder the solution you gave me referenced. Answer that worked for me: Don't use the Start button to find your Profile, use your desktop explorer starting with your Users directory and drill down from there. Learned that here: http://www.youtube.com/watch?v=zRUgxlo4U4w&feature=related (Note: The speaker and video quality isn't great but his intent is good and his message had enough helpful content to get me started. Ohers may feel the same way.)
Within the comments section replying to the above-referenced YouTube video, I then found one person who wrote this --
"If your Firefox locks up with this error as the result of a "virus" which also happened to hide all your files and desktop icons, then none of these crap Windows XP 'fixes'on YOUTUBE will work.
In 2012, you will need to install Google Chrome, make it your default browser/import bookmarks etc. Then run Firefox while Chrome is open, and Firefox will suddenly be unlocked! 8-) Amazing!!! Then just disarm Google Chrome and uninstall it, and you will have your Firefox back."
His message wasn't so kind, but I did try his solution and it worked! All appears better.
Thank you again to the community for assistance today and to jscher2000 in particular for taking the time. - j philly

Can't close firefox tabs even in safemode. (Windows 7)

I normally run firefox with NoScript and AdBlock. Lately I have been unable to close tabs and after research saw that it was recommended to try safe mode. Safe mode has been working fine for me, but just now I cleared my cache and now I can't close tabs even in safe mode.
Edit: Shortly after posting this question, I tried to open a new tab and firefox froze up. I had to close it via the task manager.

It could be the work of one of your add-ons, or even add / mal-ware.
Look thru your add-ons list and make sure you know what each one is
and what it does. Also, check the programs that are on your computer
'''Windows:''' Start > Control Panel > Uninstall Programs.
'''Mac:''' Open the "Applications" folder
'''Linux:'''
* [http://www.freesoftwaremagazine.com/articles/see_all_your_installed_applications_ubuntu_unity Ubuntu Unity]''' {web link}
* Xfce: Applications Menu category sections
* options depends on the package manager and the desktop environment
Go thru the list. If you find something that you don't
know what it is, use a web search.
'''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware Troubleshoot Firefox Issues Caused By Malware]''' {web link}

I can't close firefox nor restart my mac ibook G4 OS10.5.8 to troubleshhoot.

When firefox opens it calls for Google, but does not connect or open anything. It's done this for several days...when I tried to troubleshoot, I can't even close Firefox at all, so I can't restart. I get a message that says Firefox is not responding

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I can not close firefox unless i click on "home" 1st. also it freezes when i try to print or edit bookmarks,ect... Anyone know how to fix?

It runs ok but when i go to a page "like msn.com or facebook.com,ect..." I can not close or minimaze the browser to allow me to close i need to click the "home" button then i can close firefox.

Do you have that problem when running in the Firefox SafeMode? 
[http://support.mozilla.com/en-US/kb/Safe+Mode] 
''Don't select anything right now, just use "Continue in SafeMode."''
If not, see this: 
[http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes]

In Firefox 31.0 a bug makes the browser freeze, and then I can't close tabs anymore, what may solve this?

Good afternoon. With the newest update of Firefox for PC (31.0), I have a problem that occurs almost every time I use the browser.
When trying to close a tab, it sometimes cause the browser to freeze during one minute.
Then a dialog-box appears on the screen. It says that the script "chrome://browser/content/tabbrowser.xml:2004" may be busy.
I can choose between two buttons in this dialog-box.
"Continue" which keeps the script running, in theory; though it just closes the dialog-box, makes the browser freeze again, and then the same dialog-box shows up.
"Stop the script" which ends the freeze; but then I'm unable to close tabs (I can still close the browser).
I also noticed that, when the freeze occurs, the content of the tab I tried to close changes to "New Tab".
When I restart the browser, I am able to close tab again, until the freeze shows up again.
The problem started to appear only when I updated Firefox to the 31.0 version (and I didn't add any browser extension in the meanwhile).
Does anyone have an idea of what I could do to avoid the problem? Thank you very much and have a good day!

In the immediate future you can try noscript or flashblock addons to block that script.
However upon more research in searching the current Firefox codebase: [http://dxr.mozilla.org/mozilla-central/search?q=tabbrowser.xml&case=false] it seems to be referenced in there, but I do not see a reference to the port associated. The port is usually used for media. I would not know how to start to troubleshoot this, but are there any consistent steps/webpages that cause this to start?
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Unable to open/view documents after logging onto certain websites

There are at least three websites that I can log into but where I cannot subsequently open or view documents with Adobe Reader. When I log off of any of these sites I cannot close its page or use Firefox again until I kill process Firefox 32* with Task Manager. Using Internet Explorer I can access these sites without any of these problems. I can also access them without these problems using the same version (3.6.3) of Firefox on another computer that runs Windows XP instead of Vista.
== URL of affected sites ==
https://www2.netxview.com/mini2/login.htm

Can you please provide one of these documents for testing? If there's a confidentiality issue, is there a different document at a non-government location I can use?

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On my Facebook, there is an inch or two of blank space on each side, and my banking site, is just a small square with the info on it..

Right click the orange Firefox button to open the toolbar context menu or use (F10) View > Toolbars.
* Click the Menu Bar entry and place a check-mark to make the Menu Bar visible all the time (Windows and Linux).
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* https://support.mozilla.com/kb/why-are-tabs-top
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See http://kb.mozillazine.org/Toolbar_customization

After opening a certain website, I can't close firefox anymore

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