Why does firefox startup with previous history window

Why does my Firefox (3.6.17) now always startup with a window on the left of screen displaying all the previous url's I have used grouped into 'Today', 'Yesterday', 'last 7 days', 'May', 'April'?
I cannot remember changing any setting for this to happen and now I cannot find how to turn off this annoying window.

That are probably JavaScript window.open() calls that specify window dimensions.
You can divert those to a new tab.
* http://kb.mozillazine.org/browser.link.open_newwindow.restriction (0)
* http://kb.mozillazine.org/browser.link.open_newwindow (3)

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That are probably JavaScript window.open() calls that specify window dimensions.
You can divert those to a new tab.
* http://kb.mozillazine.org/browser.link.open_newwindow.restriction (0)
* http://kb.mozillazine.org/browser.link.open_newwindow (3)

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That is probably the "tear-off tabs" feature. A slight movement (usually downward) when clicking on an existing tab will cause that tab to "tear-off" and open in a new window. You can drag the tab back to the previous window. You can also install this add-on to stop the behavior: https://addons.mozilla.org/en-US/firefox/addon/bug489729-disable-detach-and-t/
 
 
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*Next Generation Java Plug-in 1.6.0_20 for Mozilla browsers
#'''''Check your plugin versions''''' on either of the following links':
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#*https://www-trunk.stage.mozilla.com/en-US/plugincheck/
#*'''Note: plugin check page does not have information on all plugin versions'''
#*There are plugin specific testing links available from this page:
#**http://kb.mozillazine.org/Testing_plugins
#'''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
#'''Update the [[Java]] plugin''' to the latest version.
#*Download site: http://www.oracle.com/technetwork/java/javase/downloads/index.html (Java Platform: Download JRE)
#**'''''Be sure to un-check the Yahoo Toolbar option during the install if you do not want it installed.
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A very slight movement (usually downward) will cause the tab to "tear off"/"tear away" into a new window. You can drag the tab back to the original window from the new window.
You can install this Add-on to stop the "tear off"/"tear away" behavior:
*https://addons.mozilla.org/en-US/firefox/addon/bug489729-disable-detach-and-t/
'''If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.'''
Not related to your question, but...
You need to update some plug-ins:
*Plug-in check: https://www-trunk.stage.mozilla.com/en-US/plugincheck/
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*Next Generation Java Plug-in for Mozilla browsers: [https://support.mozilla.com/en-US/kb/Using%20the%20Java%20plugin%20with%20Firefox#w_installing-or-updating-java Installing or Updating Java in Firefox]

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Why does firefox startup with previous history window

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