The only *current* version of the Flash Plugin you can get on Linux 
nowadays is through Chromium. You will need both the *chromium* package and 
the *chromium-pepper-flash* package and it will only enable Flash in 
Chromium. Using the legacy *adobe-flash-plugin* package may work with other 
browsers, but it is by now pretty much outdated and much of the 
Flash-Content out there on the Internet will not work (properly) with it.