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Lately, when I get the "Unresponsive Script" message, Neither the cancel nor the complete script button will work and Firefox hangs so I have to Force Quit Firefox. What is wrong?

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Here is the link below the message about the unresponsive script:

Script: chrome://browser/content/tabbrowser.xml:554

Neither of the buttons will work "Stop Script" or "Continue" and since Firefox is frozen or just hanging, I have to Force Quit. Today I was trying to print off a confirmation for a convention and every time I was ready to print, the Unresponsive Script would show up and freeze the printing too. After 4 times, I finally made a Grab Shot of it to print.

Here is the link below the message about the unresponsive script: Script: chrome://browser/content/tabbrowser.xml:554 Neither of the buttons will work "Stop Script" or "Continue" and since Firefox is frozen or just hanging, I have to Force Quit. Today I was trying to print off a confirmation for a convention and every time I was ready to print, the Unresponsive Script would show up and freeze the printing too. After 4 times, I finally made a Grab Shot of it to print.