Examine source code of Image Viewer

{
  "name": "__MSG_app_name__",
  "description": "__MSG_app_desc__",
  "version": "1.48",
  "default_locale": "en",
  "manifest_version": 3,
  "icons": {
    "16": "/icon/icon16.png",
    "128": "/icon/icon128.png"
  },
  "permissions": [
    "storage",
    "contextMenus",
    "scripting",
    "offscreen",
    "webNavigation"
  ],
  "host_permissions": [
    "*://*/*",
    "file:///*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cbb8131a-cebb-492a-95b3-63423d343e3f}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "options_page": "/page/options.html",
  "action": {
    "default_icon": {
      "16": "/icon/icon16.png",
      "128": "/icon/icon128.png"
    }
  },
  "content_scripts": [
    {
      "js": [
        "/scripts/activate-url.js"
      ],
      "matches": [
        "*://*/*",
        "file:///*"
      ],
      "all_frames": true
    },
    {
      "world": "MAIN",
      "js": [
        "/scripts/hook.js"
      ],
      "matches": [
        "*://*/*"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "js": [
        "/scripts/hook-helper.js"
      ],
      "matches": [
        "*://*/*"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "commands": {
    "open-image-viewer": {
      "suggested_key": {
        "default": "Alt+1"
      },
      "description": "__MSG_view_images_in_image_viewer__"
    },
    "open-image-viewer-without-size-filter": {
      "suggested_key": {
        "default": "Alt+Shift+1"
      },
      "description": "__MSG_view_all_images_in_image_viewer__"
    },
    "open-image-viewer-in-canvases-mode": {
      "suggested_key": {
        "default": "Alt+2"
      },
      "description": "__MSG_view_canvas_in_image_viewer__"
    }
  }
}