Good news -- Daniel Vetter from the upstream maintainers list responded
to the email with the more descriptive SUBJECT.

He wrote:

Still a flash bug. This commit simply enables rgb555 in the kernel,
which sna likes to use on gen2/3. Flash is just too dense and always
presumes xrgb8888.

Adding

Section "Screen"
        Identifier "igd"
        DefaultDepth 24
EndSection

to your xorg.conf will work around.

-------------

And doing so here did successfully work around the behavior for the
machines I reported on.

I note for other users that just the snippet above in an otherwise blank
xorg.conf will do.  And many users, like me, will have no existing
xorg.conf but will have to create one, such as I did at
/etc/X11/xorg.conf (though there are many other locations where X will
find the file).

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https://bugs.launchpad.net/bugs/1212455

Title:
  8086:2562 Flash 11.2 content displays in shades of green and purple
  only, and in a horizontally compressed space

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