It's a question of adoption. Asking people to install a browser addon is easier and less hassle than a whole new application. I use Thunderbird myself, but if

It's a question of adoption. Asking people to install a browser addon is easier and less hassle than a whole new application. I use Thunderbird myself, but if we want email encryption available to everyone - not just us geeks - then the simpler we can make it, the better.