Shameless plug: why not something like this: https://github.com/grafie/acceptum/tree/master/firefox/dist https://github.com/grafie/acceptum/tree/master/firefox/

Shameless plug: why not something like this: https://github.com/grafie/acceptum/tree/master/firefox/dist https://github.com/grafie/acceptum/tree/master/firefox/dist Save screen-shots to the desktop with the option of encrypting them... Oh, and it's also free...(Linux + Firefox 35+)