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Allowed popups do not load in Firefox 4

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In Firefox 4, clicked on my credit card statement link on Chase website, and an empty window opened. In Firefox 3, my statement comes up with an option to save as PDF. Cannot do this in Firefox 4. Just get a blank. Have enabled popups for this website. Uninstalled Firefox 4 and went back to Firefox 3.611, which I am now using and the site works perfectly.

In Firefox 4, clicked on my credit card statement link on Chase website, and an empty window opened. In Firefox 3, my statement comes up with an option to save as PDF. Cannot do this in Firefox 4. Just get a blank. Have enabled popups for this website. Uninstalled Firefox 4 and went back to Firefox 3.611, which I am now using and the site works perfectly.

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You should at least update to the latest Firefox 3.6.x version (currently 3.6.17).

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

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I am using Firefox 3.6.17 and the popup works. Do the instructions in your post apply to Firefox 4, which is where I am having the problem? Thanks