IFrame content swapping bug?

Question

I have a web page with a number of iframes, including 3rd party iframes like ad sense and various sharing buttons.

In Firefox, I've noticed that occasionally the content of these iframes get swapped, such that you'll get an ad sense ad where another iframe is. It seems completely random where iframe content shows up. It seems it may have something to do with caching.

Does anyone know what causes this, or any steps I can take to prevent this from happening?

Answer 1

In case anyone is looking I was able to track down the bug report:

https://bugzilla.mozilla.org/show_bug.cgi?id=356558

It's been 4 years and it doesn't even look like they have confirmed it.