Adobe Flash plugin isn't working on some sites

[Yuri <yuri@xxxxxxxxx>]

For example, flash used for editing on http://opensteetmaps.com isn't 
working at all in Firefox. On many other sites it works better with 
varying degree of malfunction.
I have Flash 10 and Firefox-3.5.2.

Is this a known problem? Is this likely to be fixed? AppDB only seems to 
talk about the design studio, not the Flash plugin itself.

Yuri