
This downloads the official (proprietary) Flash Player plugin from Adobe. Always up to date!
http://www.wikihow.com/Upgrade-Adobe-Flash-Player-on-Linux-Mint
Skip that: It currently doesn't integrate correctly with firefox. I guess Adobe broke something with recent version(s?) and didn't test before release. My advice: Stick with the default package (adobe-flashplugin), which always has verified version.