activeWindow is null RRS feed

  • Question

  • In opening Thunderbird email I get the following JavaScript Application error message "activeWindow is null"  What is this annoying message and how do I get rid of it?
    Wednesday, November 30, 2016 8:04 PM

All replies

  • Hi Dr Bob Doyle,

    This forum is discuss Silverlight with JavaScript development issue.

    As far as I know, the Thunderbird email is a client used to manage emails, which is not a Silverlight application.

    If you are a developer that do some developer for Thunderbird email client with Silverlight application, please share some code snippet about this issue. It could help us confirm what causes this issue.

    If you just a Thunderbird email client user, I suggest you contact the Mozilla support from below link to get a better help. Thanks for your understanding.


    Best Regards,

    MSDN Community Support
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    Friday, December 2, 2016 6:12 AM