Adobe has stopped supporting flash for mobile devices since November 2011. Fortunately you can still install Adobe Flash Player onto your Samsung Galaxy Note 3 through a process called side-loading. Side-loading does not require rooting your device or any kind of modification.
Installing Flash Player to your Galaxy Note 3
1. Go to Settings > General
3. Enable the ‘Unknown sources’ option under Device Administration
4. On the browser, download the Adobe Flash Player .APK file here:
5. Once the file is done downloading, open it, and install it.
6. Flash is officially installed onto your device. Use a flash-supported browser like the default browser or FireFox when browsing flash sites. Google Chrome does not support flash.