New pop-up Javascript error, could not initialize dlwatch extension, oPref.addObserver is not a function. Stops new windows to launch. Help.

Under Firefox 4 McabookPro, OS 10.6.7. When a new pop-up window open, which is necessary for some security applications, I get a Javascript error. It is said:

[Javascript error]
dlwatch (200)
Could not initialize dlwatch extension
TypeError: oPref.addObserver is not a function.

It is a problem with the Video DownloadHelper extension.

Start Firefox in Firefox to solve the issues in Safe Mode to check if one of the Add-ons is the cause of the problem (switch to the DEFAULT theme: Tools > Modules > appearance/themes).

  • Makes no changes on the start safe mode window.

See:

Tags: Firefox

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