Examine source code of Floating Translation

{
  "manifest_version": 2,
  "name": "ProTranslate",
  "version": "1.0.0",
  "description": "Floating on-page translator. Select text, translate instantly. No menus.",
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "browser_action": {
    "default_icon": "icons/icon48.png",
    "default_title": "Toggle ProTranslate panel"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "panel.css"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+T"
      },
      "description": "Toggle ProTranslate panel"
    }
  },
  "permissions": [
    "activeTab",
    "storage",
    "https://translate.googleapis.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "protranslate@addon",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}