If you’re like me, every time you turn on OS X, you launch Thunderbird, Firefox and Terminal. You can configure OS X to do this for you automatically.
First, start System Preferences. Then click on “Users & Groups”
Now, click your username in the left column, and then click “Login Items”
Now, click the little “+” under the list of applications
And add applications to the list. They will launch automatically when you log into OS X.
Don’t forget to click the lock in the lower left corner of the System Preferences window to save your changes.