A Firefox Help page appears for a moment, and is then wiped, in FF4RC

I go to the Firefox Help Page 'Viewing video in Firefox without a plugin', and the body content appears for a few moments (on my Vista laptop), and then disappears, leaving only the Title,the Contributors line, a block of white space, the nurse pussycat image and text block. The stuff on the RHS is OK.
I get the same on this w7 laptop, except I don't see the proper page at all (possibly because this laptop is quicker?).
On 3.6.15, on both laptops, the page appears correctly, I think.
I guess my question is can someone who knows how to submit a formal bug report on FF4 see if they can reproduce this, and if so, then please submit such a report?
Or you could maybe tell me what I'm doing wrong; though as it fails on two separate laptops in FF4, and works on both in FF3.6.15, I don't think I am doing anything wrong.
I've added troubleshooting info below, obediently, but I doubt it's needed...

I'll make a note of that in the correct forum about specifically stating when an article doesn't apply to Firefox 4.0.

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