Examine source code of OpenCC

{
  "manifest_version": 3,
  "name": "OpenCC",
  "author": "Tony Chan",
  "version": "0.4.0",
  "description": "Convert webpages between different Chinese variants.",
  "homepage_url": "https://github.com/tnychn/opencc-extension",
  "icons": {
    "128": "icon.png"
  },
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_idle"
    }
  ],
  "options_ui": {
    "page": "options/index.html",
    "open_in_tab": false
  },
  "action": {
    "default_icon": {
      "128": "icon.png"
    },
    "default_title": "OpenCC",
    "default_popup": "popup/index.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "tabs",
    "contextMenus"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "opencc.extension@tnychn"
    }
  }
}