The add-on adds and context-menu when right-clicked on an image, allowing user to print it quickly.
It focus on two things when printing images :
1. speed (no page settings).
2. auto orientation and scaling.
I found /usr/bin/lpr is a great tool for the job on Linux.
So when you print images with the add-on, they are downloaded to /tmp/PrintImage-UUID and the file is sent to lpr.
You may change the external tool and paramaters in preferences.
It focus on two things when printing images :
1. speed (no page settings).
2. auto orientation and scaling.
I found /usr/bin/lpr is a great tool for the job on Linux.
So when you print images with the add-on, they are downloaded to /tmp/PrintImage-UUID and the file is sent to lpr.
You may change the external tool and paramaters in preferences.