Firefox doesn't open a link van I click on a link is thunderbird, its say that firefox is active but doesn't respond, sometimes even after it has closed

When I got in an email a link and I click on it, firefox openes the first time, but when I click on the next link I get the message that firefox is active but doesn't respond.
Opening by clicking on *.htm(l) files works fine even multiple.

I suggest you to upgrade your browser to Firefox 7 and check:
* getfirefox.com

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Firefox is not letting me open another tab when I click the 'new tab' button. It says 'done' in the corner, but never opens a new tab.

Firefox is not letting me open another tab when I click the button or the 'new tab' in file. I have restarted my computer, installed an update, and I still have the same problem browsing.

In past threads, this problem has been linked with the Ask toolbar.
[http://support.mozilla.com/en-US/questions/784371 I can't open a new tab anymore; what happened? | Firefox Support Forum | Firefox Help]
[http://support.mozilla.com/en-US/questions/788008 New tab button does not work, nor does "Open New Tab" toolbar icon. | Firefox Support Forum | Firefox Help]
And several users mentioned a link between Foxit Reader and Ask toolbar:
[http://support.mozilla.com/en-US/questions/786427 "Open a new tab" is not working in Firefox 3.6.13 on WindowXP NT | Firefox Support Forum | Firefox Help]
[http://support.mozilla.com/en-US/questions/794912 I can't open a new tab | Firefox Support Forum | Firefox Help]

Firefox is already actif but does not respond. and even after changing the default properties the problem comes back (Read-only)

everytime I close Firefox, it select the option "Read-only".
I stop the proces via Task management and then I can start Firefox again. I close it and the "Red-only" option is back again.

Do you get this error only after closing and restarting Firefox or always?
In case of the latter:
Do you still have a default profile and is the profile as you see in the profiles.ini file marked as "Default=1" still present?
*http://kb.mozillazine.org/Profile_folder_-_Firefox
Try to delete the profiles.ini file to force Firefox to create a new profiles.ini file and a new default profile.
*http://kb.mozillazine.org/profiles.ini_file
*https://support.mozilla.org/kb/Firefox+is+already+running+but+is+not+responding
*http://kb.mozillazine.org/Profile_in_use

Firefox did an automatic update to 6.01, and now my middle mouse button is not working in the browser. It doesn't close tabs, it doesn't open new tabs by middle clicking a link, it doesn't allow me to middle click to scroll the page...

Firefox did an automatic update to 6.01, and now my middle mouse button is not working in the browser. It doesn't close tabs, it doesn't open new tabs by middle clicking a link, it doesn't allow me to middle click to scroll the page..

[BUG FIXED, see "EDIT 2" at the end of my post]
I'm on Firefox 3.6.21, and I got this problem today after a Greasemonkey update (To version 0.9.10, apparently).
Disabling Greasemonkey solved the problem, and re-enabling it reproduced the problem (middle-clicking links to open in new tab did not work, merely highlighted the link).
I should also note that while Greasemonkey was enabled and the bug was affecting me, Ctrl+Click to open links in new tabs was also broken.
I hope this helps!
EDIT: It appears this is a known incompatibility/conflict bug between current versions of Greasemonkey and Tab Mix Plus. Read more here:
https://github.com/greasemonkey/greasemonkey/issues/1406
EDIT 2: GREASEMONKEY HAS NOW BEEN UPDATED with a workaround to fix the problem. Go to https://addons.mozilla.org/en-US/firefox/addon/greasemonkey/versions/ to install the update manually. It hasn't been reviewed by Mozilla yet, so it won't be an automatic update for another day or two. All credit to "cannonfodder" below for noticing this; please mark his post as helpful!

Web site still says that Firefox doesn't accept cookies

Hi,
The web page mail.hitmessaging.net/ suddenly says that Firefox doesn't accept cookies so I followed all your instructions on this page
http://support.mozilla.com/en-US/kb/Websites%20say%20cookies%20are%20blocked
and restarted the browser and then the computer but the problem remains. I clicked OK after having changed the settings in "Tools"-"Privacy" exactly as you recommend (I have double-checked) but when I open that menu again the changed settings haven't been saved. The setting is still "Remember history" instead of "Use customer settings for history" no matter how many times I try to change the setting. I'm using the Swedish version of Firefox 6 and I didn't have this problem with any home page before upgrading to Firefox 6.
Best regards,
Claes Vestermark
Stockholm, Sweden

Please see the support article [[Preferences are not saved]]. The article provides several possible remedies.
Let us know how you get on.

Our CRM system opens a tab everytime I click on a link, is there a way to avoid this?

Our CRM system opens a tab everytime I click on a link, is there a way to avoid this?

Hi andreamonni,
Yes there is check out the feature opening a new window in a new tab.
Firefox menu > Preferences > Tabs the first check box.
If this is happening only on this website:
In order to change your Firefox Configuration please do the following steps :
# In the [[Location bar autocomplete|Location bar]], type '''about:config''' and press '''Enter'''. The about:config "''This might void your warranty!''" warning page may appear.
# Click '''I'll be careful, I promise!''' to continue to the about:config page.
browser.link.open_newwindow
2 (default in SeaMonkey and Firefox 1.5): In a new window
3 (default in Firefox 2 and above): In a new tab
1 (or anything else): In the current tab or window
or
browser. link. open_newwindow. restriction
please see [http://kb.mozillazine.org/Firefox_:_FAQs_:_About:config_Entries]

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

When I try to open Firefox, I get a message saying that firefox is already currently running, although it is not running. Close and try again or restart computer. How can I fix this?

I always close Firefox when I am finished with the web. When I try to open it later, I often get a message saying that firefox is currently running, so close it first. As far as I can tell, firefox is not running. The message then says to restart your computer and try again. I restart my computer and then firefox opens.

https://support.mozilla.com/en-US/kb/Firefox%20hangs See '''hang-at-exit'''

I can't get firefox to open. Try creating another profile as suggested in another answer, and it says that firefox has crashed, how do I get firefox working?

I had to restore my computer to a previous restore point. When I tried opening firefox 4.0, nothing happened. Frustrated, I tried removing the program, but ran into the same problem: nothing happened. I went to Processes in Windows Task Manager, and firefox.exe was not running. Tried using the suggestions to create another profile, and entering the command into run brought up an error saying that firefox has crashed.

OK - undo the changes you made to DEP.
Open Firefox - take a screenshot of any message that appears and post back here

Firefox will not open at all. I tried to remove it from the programs to try to reinstall it but it wont let me remove it. So I tried to download again anyways and ff still wont open. My email is alicia@*****

Firefox will not open at all. I tried to remove it from the programs to try to reinstall it but it wont let me remove it. So I tried to download again anyways and ff still wont open. My email is alicia@****

Did you check your security software (firewall)?
A possible cause is security software (firewall) that blocks or restricts Firefox without informing you about that, possibly after detecting changes (update) to the Firefox program.
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 and the plugin-container process.
See [[Server not found]] and [[Firewalls]] and http://kb.mozillazine.org/Firewalls
If necessary then also see:
* http://kb.mozillazine.org/Browser_will_not_start_up
* http://kb.mozillazine.org/Error_loading_websites

I am using server and client systems when i am trying to open the browser in two or more machines it says that firefox is already running, i want to open the browser in all machines simeltaniously

I am using server and clients machines in my office, here i want to open browsers in all systems simultaneously but i am unable open the browser, when i am trying to open the browser in the second machine it says that firefox is already open... pls. solve this problem
Thank you

You can't open one Profile more than once. You need a separate Profile for each browser on each PC that you open.
https://support.mozilla.com/en-US/kb/Profiles

I have firefox on the server. When I click on it, I get a message saying that an upgrade canot be done as other Firefox may be running. There is no other Firefox running. And then the browser opens ups

It actually says that Firefox is already running but not responding and the other window needs to be closed. Cannot find any other window running.
Only happens on the server.
OK on the PC desktop

I have similar problem on Win XP if i have used Firefox 4 but have closed it, then try to open Firefox again; it will give me that error message.
Message says to reboot but that is not always possible if I am in the middle of another program.
I found that if you open the windows task manager (ctrl + alt+ del) >>processes tab
highlight the "image name" firefox.exe and click end process.
Firefox will then restart normally.

Since upgrading to Firefox 27.0 some webpages will not load when I click on them. It gives me a message saying that Firefox can't find the server.

Since upgrading to Firefox 27.0 some webpages will not load when I click on them. It gives me a message saying that Firefox can't find the server. I have to click the link several time before it will load and sometimes when they do load it does not show the page right. It is like the HTML is messed up or something. I have tried everything I can think of. I started in safe mode, still did it., I removed add-ons, still did it., I reset Firefox and still did it., I completely uninstalled Firefox and re-installed Firefox and it still does it. I have tried Malware Bytes Anti-Malware scans and Avast boot-time scans and found no malware or viruses. I have found that those websites open the first time with no problems on my IE9 and they used to do so in Firefox 26.0. I'm at my wit's end. The website links are in my bookmarks and are used all the time so they are trusted and my avast is set to allow them. They range from news websites to gun websites and everything I have read says that Mozilla does not filter those unless something has changed recently.

Try this as a first step; 
Clear the Cache '''''Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"''''' 
and 
Remove Cookies '''''Firefox/Tools > Options > Privacy > Cookies: "Show Cookies"''''' 
If there is still a problem,
'''''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode]'''''
While you are in safe mode;
'''''Firefox Options > Advanced > General'''''. Look for and turn off '''Use Hardware Acceleration'''.

I uninstalled Firefox once, reinstalled it and it ran. I had a problem so I did it again. Now it will not run and I get an error message saying that firefox is running and you can only run one at a time. I can't figure out what is running.

Because of a problem, I uninstalled Firefox once, reinstalled it and it ran. I had a problem so I uninstalled/reinstalled it again. Now it will not run. I get an error message saying that firefox is running and you can only run one at a time. I have uninstalled multiple times and can't figure out what is running. The is only one Firefox installed and it is not open. What does this mean and how do I fix it?

If you use ZoneAlarm Extreme Security then try to disable Virtualization.
*http://kb.mozillazine.org/Browser_will_not_start_up#XULRunner_error_after_an_update
See also:
*[[/questions/880050]]

My browser has been closed all night and in the morning I get an error saying that Firefox is still running and I need to shut it donw. Why is this?

I close the browser and it does not matter how much time elapses it still says that Firefox is running. I am told to close Firefox before I can open another session. I hit ctrl+alt+del to pull the task manager and it does not show any Firefox applications.

There is no '''5.1''' - Firefox 5.'''0'''.1 was a special version to fix some Mac OSX issues which Apple created with the 10.5 and 10.6 updates and the release of 10.7 Lion last week. Windows and Linux versions don't need those patches and weren't updated. The global download server array can't handle different version numbers for different OS platforms, so the full download versions had to be version number "bumped" for Windows & Linux to match the new Mac version number.
As far as your support question, you probably had a "hung" Firefox '''Process''' - look in the '''Processes''' tab in the Task Manager. 
https://support.mozilla.com/en-US/kb/Firefox%20hangs See '''hang-at-exit'''

Firefox doesn't open a link van I click on a link is thunderbird, its say that firefox is active but doesn't respond, sometimes even after it has closed

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