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When I attempt to open firefox an error message appears telling me that firefox is already running, but I can't find it running. How do I do so or in any case close the already running Firefox process?

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  • 23 have this problem
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  • Last reply by Helper7677

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When I attempt to open Firefox instead of Firefox opening, an error message appears saying "Firefox is already running but isn't responding. To open another window please close the existing Firefox process or restart the system.", but I can't find that process of Firefox in order to kill it, and after restarting the system there is still the problem. I have found an emergency fix to at least get online, and that is to use"Firefox_Profile_Manager" in the start menu's "run" start menu, but the Firefox that then opens is that one doesn't carry over what I had in my bookmarks but starts bookmarks anew.

Modified by caploc

All Replies (2)

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You should uninstall that 4.0 beta 10 version and install the 4.0.1 release.


Check that you still have the profile folder as listed in profiles.ini

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Sounds like it is hanging when you exit and later try to restart Firefox.




You need to update the following:

  • Adobe Shockwave for Director Netscape plug-in, version 11.5
  • Adobe PDF Plug-In For Firefox and Netscape "9.3.2"
  • Shockwave Flash 10.2 r153
  • Next Generation Java Plug-in 1.6.0_17 for Mozilla browsers
  1. Check your plugin versions on either of the following links':
  2. Update Shockwave for Director
    • NOTE: this is not the same as Shockwave Flash; this installs the Shockwave Player.
    • Use Firefox to download and SAVE the installer to your hard drive from the link in the article below (Desktop is a good place so you can find it).
    • When the download is complete, exit Firefox (File > Exit)
    • locate and double-click in the installer you just downloaded, let the install complete.
    • Restart Firefox and check your plugins again.
    • Download link and more information: http://support.mozilla.com/en-US/kb/Using+the+Shockwave+plugin+with+Firefox
  3. 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):
    • After the installation, start Firefox and check your version again.
  4. Update the 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
    • After download is complete, exit Firefox
    • 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/
      • Use Firefox to go to the above site to update the Firefox plugin (will also install plugin for most other browsers; except IE)
      • Use IE to go to the above site to update the IE ActiveX
    • Download Manual installers.
  5. Update the Java plugin to the latest version.