Examine source code of Daemon Image Snatcher

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "description": "__MSG_extDescription__",
  "version": "2.0.0",
  "icons": {
    "16": "/icon/16.png",
    "24": "icon/24.png",
    "32": "/icon/32.png",
    "64": "/icon/64.png",
    "128": "/icon/128.png",
    "256": "/icon/256.png"
  },
  "default_locale": "en",
  "author": "hellsoftware.dev@gmail.com",
  "permissions": [
    "activeTab",
    "downloads",
    "storage",
    "sidePanel",
    "<all_urls>"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "daemon-image-snatcher@hellsoftware.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Kehai Image Snatcher",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}