[Solved] c.defaultView.getComputedStyle(h, null) is null – Error

Question:

Why jquery doesnt work properly on iframes with firefox

Ans:

The final solution was to update jQuery to lastest version.

This is a bug that was fixed in version 1.6.1 (http://blog.jquery.com/2011/05/12/jquery-1-6-1-released/, item #8763)

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Quoted from:

http://stackoverflow.com/questions/6439135/it-doesnt-work-properly-on-iframes-with-firefox-why