Comment 79 for bug 263435

(In reply to comment #78)
> Note that the problem occurs only when the mouse pointer is in the plugin area.
> The shortcuts do work when the pointer is in other parts of the browser window
> (e.g., toolbar or menubar), or outside it.
> (Firefox 1.0, Linux, KDE 3.3)

Not really true, at least not on OS X 10.3.7:
The focus has to change. In the case of the flash plug-in, once it has focus,
one has to click somewhere else. Simply clicking somewhere in the bookmarks bar
or another toolbar wont' do. I found that clicking into the address field
removes focus from the flash plugin, as well as clicking in the html-area of a
site, if the plug-in doesn't take up the whole browser window.
Simply having the mouse cursor over another area won't do it.