When I close the last tab I am sent to my desk top and do not stay on Firefox, but if I hit the open button again it says Firefox is running??

This started this last weekend. When I close the last tab instead of staying on Firefox it goes directly to my desktop. If I hit the Firefox icon again I get a message saying that Firefox is still running and that I should restart. But if I just hit open again it reopens or shows Firefox home page again. How do I stop this?

Set the pref browser.tabs.closeWindowWithLastTab to false on the about:config page to prevent closing the last tab from closing that window, you need to use "File > Close Window" or the close X on the title bar.
To open the <i>about:config</i> page, type <b>about:config</b> in the location (address) bar and press the "<i>Enter</i>" key, just like you type the url of a website to open a website.<br />
If you see a warning then you can confirm that you want to access that page.<br />
*Use the Filter bar at to top of the about:config page to locate a preference more easily.
*Preferences that have been modified show as bold(user set).
*Preferences can be reset to the default or changed via the right-click context menu.
You may need to wait a bit longer before restarting Firefox.
See "Hang at exit":
*http://kb.mozillazine.org/Firefox_hangs
*https://support.mozilla.com/kb/Firefox+hangs

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