This extension helps people with an color deficit. It adds a new menu item to the context menu for images. With this menu item you can analyze an image on colorblinds.org with one click. You can specify your kind of color deficit (Protanopia, Deuteranopia or Tritanopia) in the preferences menu of this extension. Colorblinds.org will daltonize the selected image then according to your color deficit.
This Extension does not require any additional software and will run on any operating system.