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Firefox will not allow any new windows to open when clicking on a link which opens a new window

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ResinEight
ResinEight

When clicking on any link which opens a new window, Firefox will do nothing when I click on the link. Then, if I close Firefox, I cannot open it again as it says something along the lines of "Firefox is already running on this computer."

I read that this may be a Java issue, but I have installed the latest version of Java AND the latest version of Firefox.

This issue occurs on any website in which a link opens a new window (for example, when on ebay, clicking the "enlarge" button beneath the photo on a listing).

When clicking on any link which opens a new window, Firefox will do nothing when I click on the link. Then, if I close Firefox, I cannot open it again as it says something along the lines of "Firefox is already running on this computer." I read that this may be a Java issue, but I have installed the latest version of Java AND the latest version of Firefox. This issue occurs on any website in which a link opens a new window (for example, when on ebay, clicking the "enlarge" button beneath the photo on a listing).

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cor-el
cor-el
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Start Firefox in Use Troubleshoot Mode in Firefox to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).

See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems

See also http://kb.mozillazine.org/Firefox_hangs and Firefox hangs or is not responding - How to fix (Hang at exit)