I know HTML5 has been widely adopted. Let's face it though. There are sites which will not change over and resources which are Flash based that will never be converted. That's why I always install Flash Player on my Android devices.
Note: Search function on XDA is disabled. Not sure if this is a repost here. If it is, sorry. Two, I did make a couple of errors on the video. I have a young baby girl that needs a lot of attention. I did not reshoot.
Prep
Make sure you go to settings > general tab > security and allow install from unknown locations.
Download
Flash download link: http://flash.cricketusers.com
Go to that link from your device. It will start the download automatically. This is a version I've used for a number of devices for a good amount of time.
Browsers
Download your favorite browser. It won't work on stock, and it won't work on all browsers in general. I'm sure people will start to chime in one what worked and what didn't.
Dolphin Browser - works and it is my choice because it allows for an always on option. This device is powerful, and I think it can process most sites with ease.
Boat Browser - didn't see an always on option here. Looks like it has to be on demand. This means you have to click the little download icon to load the Flash object. That was one of the errors in the video.
If you have any questions, comments, concerns, gripes, b..., moans, etc feel free to post a reply!
KitKat 4.4 Update
I don't have the S4 with me anymore, but below is a video of flash player being installed on my wife's Nexus 5.
The modified flash apk has been placed at: http://flash2.cricketusers.com
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