Jeffrey Needle - 2015-09-14

Two problems. First, I'm trying to add an application launcher to the top bar of Simplicity. I create the launcher and go to edit it to add Thunderbird to the launcher, but Thunderbird doesn't appear anywhere in the applications lists! I had no problem adding Google Chrome. Why doesn't Tbird show up in the application list?

Also, I want to set Tbird as the default mail app. Where is the Thunderbird app saved in the system so I can manually enter it as the default?

Thanks.