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

Install

• License: MIT License
• Weekly downloads: 16
• Average daily users: 842
• Rating: 3.6667/5 of 51 ratings
• Created: 2015-11-06 20:51:07
• Last updated: 2019-06-07 02:40:18
• Homepage:
• Support site and email
• Orig: https://addons.mozilla.org/en-US/firefox/addon/easy-image-blocker/
• API: @easyimageblocker