Is there an event that tells when the window is visible (painted, not black)?

My Xul app will run in a very slow system, and the "active" event of the Xul windows is called while my window is still not visible (the window area is black waiting for the w开发者_如何转开发indow to be painted). A second later the window is painted.

Is there an event that tells when the window is visible (painted, not black)?

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Maybe the MozAfterPaint event will help you.

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Does window.onload work any better?

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I think you are dealing with the limitations of old hardware :)

If there is an image in your page, you could try adding onload to the image and see what happens...

If you are using a specific box, couldn't you use window.setTimeout()?