Firefox reporting errors

[#1]

Just doing some work in Firefox and noticed that it is consistently flagging a number of errors on many pages:

Not done much investigation yet but considered it worth reporting.

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Loading mixed (insecure) display content "http://img06.deviantart.net/87f8/i/2006/131/d/2/tux_ninja_by_fragmeister.png" on a secure page[Learn More] Community
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uncaught exception: module definition dependecy not found: tinymce/util/Tools <unknown>
Use of getPreventDefault() is deprecated. Use defaultPrevented instead.

[#2]

Hi Maurice, I recognise a couple of those, and the links are to do with stuff in people's sigs or Avatars.

The middle one belongs to Penny, the last one to 7up, but which post did you see the first one in?

The last bit sounds like a Forum bug -

uncaught exception: module definition dependecy not found: tinymce/util/Tools <unknown>
Use of getPreventDefault() is deprecated. Use defaultPrevented instead.

What do you think @mtrinder?