Script debugging can be stopped in Internet Explorer.
From an old thread:
You can stop the JITD window from popping up by disabling script debugging in Internet Explorer:
-> Internet Options
-> tab: Advanced
-> in the list, under Browsing, check the box "Disable script debugging (Internet Explorer)"
-> also check "Disable Script Debugging (Other)
-> click Apply, and OK
You may also want to uncheck the box "Display a notification of every script error".
If you have Visual Studio (or Compaq Visual Fortran) installed, you can turn off the JITD feature in general. Open Developer Studio, select Tools, Options, Debug. Then uncheck the "Enable Just-In-Time Debugging" box and click OK.
Basically if your system is totally up to date and I assume it is, and your browsers and add-ons are set to default settings, all should be normal.
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