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Tabs will open but won't close.

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I have checked other forums, and the only answer I found was to make sure Firefox is up to date, and mine is. What else can I do to fix this?

I have checked other forums, and the only answer I found was to make sure Firefox is up to date, and mine is. What else can I do to fix this?

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Solution 1: Refresh Firefox

Note: When using the refresh feature, your bookmarks, browsing history, open tabs, windows, passwords, cookies and web form auto-fill information will be saved. However, your extensions and themes will be removed and your preferences will be reset. Learn more.

   Click this Refresh Firefox button directly, if you are viewing this page in Firefox (it won't work if you are using a different browser). You will also find a Refresh button on the top right corner of the Firefox about:support Troubleshooting Information page.
   To continue, click Refresh Firefox in the confirmation window that opens.
   Firefox will close to refresh itself. When finished, a window will list your imported information. Click Finish and Firefox will open. 

Note: There's also a Refresh Firefox button in the Firefox Safe Mode window, if you can't start Firefox normally.

Solution 2: Delete Firefox preference files

   Click the menu button New Fx Menu , click help Help-29 and select Troubleshooting Information. The Troubleshooting Information tab will open.
   Under the Application Basics section, click on Show Folder. A window with your profile files will open.
   Note: If you are unable to open or use Firefox, follow the instructions in Finding your profile without opening Firefox.
   Click the menu button New Fx Menu and then click Exit Close 29
   Locate and delete the file prefs.js (or rename it, for example, to prefs.jsOLD, to keep the old file as a backup). If you find more than one, a prefs.js.moztmp file or a user.js file, delete (or rename) these as well.
   You can close the profile folder and open Firefox now.