Quoting Joachim Fahrner (jf@???):

> You can try Google Chrome (not Chromium). AFAIK that's the only
> browser for Linux that still supports Flash.

As mentioned separately, pepperflashplugin-nonfree (the PPAPI[1]
proprietary Google-written Flash player _for_ Google Chrome) works in
Chromium -- because after all, Google Chrome is just Chromium with a
bunch of dodgy proprietary bits tacked on.

Debian Project's page about that:
https://wiki.debian.org/PepperFlashPlayer/Installing


[1] PPAPI is a similar but different Google rewrite of the old NPAPI
plug-in interface. (The latter has been standard in Mozilla-family Web browsers,
but is being phased out starting 2013 as part of browser wrecking^W improvement.)
https://en.wikipedia.org/wiki/Google_Native_Client#PPAPI
https://en.wikipedia.org/wiki/NPAPI#Browser_support

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