I was wondering, does Mechanize::Firefox work with flash pages?

No. Sure, it will download the flash page, and run the flash (its firefox), but you can't call methods on the flash, just like javascript can't call methods on the flash, cause firefox/flash/mozrepl don't support that

You might be able to use Win32::GuiTest or X11::GUITest but I'd much rather figure out what the flash is doing, much less fragile

FWIW this ought to be discussed in mozrepl/WWW::Mechanize::Firefox::FAQ but I couldn't find it

Also, flash might have changed to allow some level of manipulation by javascript other than ... but I don't follow that , and it doesn't really jive with adobe's "exclusivity" business model(?)