Easy Image Blocker por Akira Atsumi

Image like Opera does not work properly in the latest Firefox, so I tried to create it based on WebExtensions.
It has the following functions.

* Four operation modes
1. Load no images
2. Load images you have read
3. Load images on this site only
4. Load all images

* Setting
· Whitelist to specify the URL to load images
· Import / export whitelist
· Whether to add the context menu
· Whether to have modes independently for each tab