Examine source code of HideImagesAndVideos

{
  "manifest_version": 2,
  "name": "Good Company",
  "description": "If a page is Good Company, show its graphics. On all other pages, block images.",
  "version": "0.6.0",
  "short_name": "Good Co",
  "author": "serv-inc",
  "icons": {
    "192": "images/baseline_thumbs_up_down_black_48dp.png"
  },
  "applications": {
    "gecko": {
      "id": "@good-co"
    }
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "all_frames": true,
      "js": [
        "content/blockif.js"
      ]
    }
  ],
  "storage": {
    "managed_schema": "schema.json"
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "48": "images/baseline_thumbs_up_down_black_48dp.png"
    },
    "default_title": "Good Company?",
    "default_popup": "popup/popup.html",
    "theme_icons": [
      {
        "light": "images/baseline_thumbs_up_down_black_48dp.png",
        "dark": "images/baseline_thumbs_up_down_black_48dp.png",
        "size": 48
      }
    ]
  }
}