Examine source code of Translate Image

{
  "manifest_version": 2,
  "name": "Translate Image",
  "description": "Translate images in browser",
  "version": "1.0.2",
  "icons": {
    "16": "icon-16.png",
    "32": "icon-32.png",
    "48": "icon-48.png",
    "64": "icon-64.png",
    "96": "icon-96.png",
    "128": "icon-128.png",
    "256": "icon-256.png"
  },
  "permissions": [
    "contextMenus",
    "activeTab",
    "scripting",
    "declarativeNetRequest",
    "<all_urls>"
  ],
  "externally_connectable": {
    "matches": [
      "<all_urls>"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ya-translate-image@firefox",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": []
}