Examine source code of mini work plan

{
  "manifest_version": 2,
  "name": "work plan",
  "version": "1.0.0",
  "description": "工作计划",
  "icons": {
    "16": "assets/images/plan.png",
    "48": "assets/images/plan.png",
    "128": "assets/images/plan.png"
  },
  "background": {
    "page": "background.html"
  },
  "browser_action": {
    "default_icon": "assets/images/plan.png",
    "default_title": "工作计划",
    "default_popup": "popup.html"
  },
  "homepage_url": "https://www.google.com",
  "default_locale": "zh_CN"
}