Is it dangerous or non-advisable to replace mint-flashplugin with flashplugin-nonfree?
I don't have 'mint-flashplugin' installed on my LMDE (which is a pretty standard installation) but I do have flashplugin-nonfree installed. I have never noticed any problems with videos either, but then normally I will run them from Opera and sometimes from Chrome, but hardly ever from Firefox.
I would install the remove the mint plugin and replace it with the nonfree plugin, and if that doesn't work install Opera or Chrome as well as FF.
Fujitsu Lifebook AH532. Intel i5 processor, 6Gb ram, Intel HD3000 graphics, Intel Audio/wifi. Realtek RTL8111/8168B Ethernet.Lubuntu 13.10,Ubuntu12.10 (Unity), Mint16 (Cinnamon), Manjaro (Xfce).