Firefox does not open. Cannot update or delete. Says it is already open and I can't find how to close it.

Firefox shows that it is already open and must be closed in order to update or delete. I can't locate a place to complete the process. It's probably something very simple, but I'm not a computer genius. Thank you!

Have you tried you look for firefox.exe in the Task Manager process tab (you can get to that by using Ctrl-Alt-Delete, usually)? If you click firefox.exe in the list and then click on end process, it should close Firefox, even if Firefox does not seem to be running (sometimes the process takes a little longer to close the main window). If all else fails, maybe a reboot?

Tags: Firefox

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    I've never tried it myself, but the forum has a series of measures for a "clean reinstall" Firefox. Even if you do not delete the record of your personal settings (AKA profile) during this process, a backup of this folder is always a good idea in case something goes wrong.

    Some Firefox problems can be solved by performing a clean reinstall. This means that you remove Firefox program files, and then reinstall Firefox. Please follow these steps:

    Note: You can print these steps or consult them in another browser.

    1. Download the latest version of Firefox from http://www.mozilla.org office and save the installer to your computer.
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        • C:\Program Files\Mozilla Firefox
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      • Mac: Delete Firefox in the Applications folder.
      • Linux: If you have installed Firefox with the distribution-based package manager, you must use the same way to uninstall: see Install Firefox on Linux. If you have downloaded and installed the binary package from the Firefox download page, simply remove the folder firefox in your home directory.
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    See:

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    Hello arcandl, at the launch of the firefox is not after you double-click the shortcut, it is sometimes also a sign of active malware on a system.
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    • button "3-bar" menu > "?" button > troubleshooting information
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    • type or paste everything: in the address bar and press Enter

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    Leave this window open, switch back to Firefox and output, either:

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    Scroll down and rename xulstore.json to something like xulstore.old. If you see a file named localstore.rdf, rename this to localstore.old.

    Launch Firefox back up again. Windows normally appear again?

    Then, to re - light bars, you can use one of the following methods to view the list of the toolbar, and then select the desired bars it:

    To activate the menu bar, toolbar bookmarks or other bars, click it in the list.

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    Yesterday, I was able to open my new Wix website on firefox and Chrome, but today Firefox does not open it on my computer but it if it opens on my friend's computer. Help, please!

    It is possible that your security (firewall, antivirus) software blocks or limit Firefox or the process of plugin-container without you inform, possibly after the detection of changes (update) for the Firefox program.

    Delete all rules for Firefox and the plugin-container in the permissions list in the firewall and leave your firewall again ask permission get full and unrestricted, access to the internet for Firefox and the plugin-container and the update process.

    See:

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    Firefox does not open the tabs on my browser. I tried to use all opportunities to open a new tab - using the 'more' (+) button does not work, "Ctrl + T" does not work, go to file and click on 'new tab' did not work either? Help please!

    Uninstall the Ask Toolbar. It can cause this problem.

    If this does not solve your problem:

    If this answer solved your problem, please click 'Solved It' next to this response when connected to the forum.

    Not related to your question, but...

    You may need to update some plug-ins. Check your plug-ins and update if necessary:

  • Currently, Firefox does not open gmail or yahoo mail, it will be open to all other web addresses, which seems to be the problem?

    Since Thursday, March 20, 2014 sometime after about 16:00 my Firefox does not open Gmail or Yahoo accounts, I can always open web pages to other web addresses. I don't remember the updates or changes to my laptop during the day. I use Win 7 Professional and 28 of Firefox.
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    Empty the cache of google.com & yahoo.com. -Select

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    You can also read this article if the instructions above does not work.

    https://support.Mozilla.org/en-us/KB/fix-login-issues-on-websites-require-passwords

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