I can't open up a new tab by clicking on it

Question

Since yesterday, when I click on a new tab, it doesn't open.
Sometimes a new site I enter in the browser window will open up in the same tab I was in just before this - and sometimes a new tab will open.

Answer 1

There is an incompatibility between the Ask Toolbar (which you have installed) and Firefox 3.6.13. Disable it or un-install it until Ask fixes the incompatibility.
*http://support.mozilla.com/en-US/kb/Uninstalling+add-ons
*http://support.mozilla.com/en-US/kb/Cannot%20uninstall%20an%20add-on
<br />
'''Other issues needing your attention'''
The information submitted with your question indicates that you have out of date plugins with known security and stability issues that should be updated. To see the plugins submitted with your question, click "More system details..." to the right of your original question post. You can also see your plugins from the Firefox menu, Tools > Add-ons > Plugins.
*Next Generation Java Plug-in 1.6.0_21 for Mozilla browsers
**3 updates behind; 2 security updates, 1 stability update
**Version 1.6.0_24 released 2011-02-10
#'''Check your plugin versions''': http://www.mozilla.com/en-US/plugincheck/
#*'''Note: plugin check page does not have information on all plugin versions'''
#'''Update the [[Java]] plugin''' to the latest version.
#*Download site: http://www.oracle.com/technetwork/java/javase/downloads/index.html (Java Platform: Download JRE)
#*Also see "Manual Update" in this article to update from the Java Control Panel in Windows Control Panel: http://support.mozilla.com/en-US/kb/Using+the+Java+plugin+with+Firefox#Updates
#* Removing old versions (if needed): http://www.java.com/en/download/faq/remove_olderversions.xml
#* Remove multiple Java Console extensions (if needed): http://kb.mozillazine.org
#*Java Test: http://www.java.com/en/download/help/testvm.xml