Examine source code of Image Fullscreen Pin

{
  "manifest_version": 3,
  "name": "Image Fullscreen Pin",
  "version": "1.9.3",
  "description": "Pin and view images from other tabs in fullscreen mode",
  "browser_specific_settings": {
    "gecko": {
      "id": "imagefullscreenpin@silverrabbit.local",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "toggleFit": {
      "suggested_key": {
        "default": "Alt+B"
      },
      "description": "Toggle auto-fit"
    },
    "rotateLeft": {
      "description": "Rotate left"
    },
    "rotateRight": {
      "description": "Rotate right"
    },
    "brightDown": {
      "description": "Brightness down"
    },
    "brightUp": {
      "description": "Brightness up"
    },
    "brightReset": {
      "description": "Reset brightness"
    },
    "reset": {
      "description": "Reset view"
    }
  },
  "incognito": "spanning"
}