Examine source code of Pinyin It

{
  "manifest_version": 2,
  "name": "Pinyin It",
  "version": "2.0.0",
  "description": "Add pinyin to Chinese characters",
  "developer": {
    "name": "sfy",
    "url": "https://github.com/sfengyuan"
  },
  "icons": {
    "48": "icons/fan.svg",
    "96": "icons/fan.svg"
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icons/fan.svg",
    "default_title": "Pinyin It"
  },
  "page_action": {
    "default_icon": "icons/fan.svg",
    "default_title": "PINYIN ALL",
    "show_matches": [
      "<all_urls>"
    ]
  },
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "content_scripts": [],
  "options_ui": {
    "page": "options/index.html",
    "browser_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "faked.jacob.sun.meta@gmail.faked.com"
    }
  }
}