Press Super+R to rotate the focused window and press again to stop. Press Super+Shift+R to reset. no OSD in GNOME 45-48
Note: Binary files aren't shown on the web site. To see all files, please download the extension zipfile.
If you don't want to expose any preferences, omit the prefs.js file. Using an empty window just looks broken. (I'll also note that "settingsData" is set and cleared up, but never actually used.)