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Firefox will not open popup initiated by javascript

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When I click on the link at the fidelity.com web site that should open a popup window, nothing happens.. later Firefox will "sometimes" use up all of my PC's cpu cycles and I am forced to use task manager to shut down Firefox.. but Firefox continues to run as a process even though it is no longer on my desktop.

I have tried turning off the popup blocker but that doesn't help (even though this site is in my exceptions list). Other javascript functions seem to work OK. also, when I copy the link location and remove the Javascript wrapper, I can open the link in a new tab without a problem.

When I click on the link at the fidelity.com web site that should open a popup window, nothing happens.. later Firefox will "sometimes" use up all of my PC's cpu cycles and I am forced to use task manager to shut down Firefox.. but Firefox continues to run as a process even though it is no longer on my desktop. I have tried turning off the popup blocker but that doesn't help (even though this site is in my exceptions list). Other javascript functions seem to work OK. also, when I copy the link location and remove the Javascript wrapper, I can open the link in a new tab without a problem.