Examine source code of Chronos

{
  "manifest_version": 2,
  "name": "Chronos",
  "version": "0.8.2",
  "description": "Manage timesheets in Tryton",
  "icons": {
    "16": "icons/chronos-16.png",
    "48": "icons/chronos-48.png",
    "128": "icons/chronos-128.png"
  },
  "background": {
    "scripts": [
      "bower_components/jquery/dist/jquery.js",
      "backend.js",
      "background.js"
    ]
  },
  "browser_action": {
    "browser_style": false,
    "default_icon": {
      "16": "icons/chronos-16.png",
      "48": "icons/chronos-48.png",
      "128": "icons/chronos-128.png"
    },
    "default_popup": "chronos.html",
    "default_title": "Enter timesheet",
    "theme_icons": [
      {
        "light": "icons/chronos-light.svg",
        "dark": "icons/chronos.svg",
        "size": 16
      },
      {
        "light": "icons/chronos-light.svg",
        "dark": "icons/chronos.svg",
        "size": 32
      }
    ]
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+I"
      }
    }
  },
  "permissions": [
    "*://*/",
    "alarms"
  ]
}