Examine source code of Muse

{
  "name": "Muse",
  "description": "Save tabs, links, and selected content into your Muse app.",
  "version": "0.1.0",
  "author": "Muse Software",
  "homepage_url": "https://museapp.com/",
  "options_page": "options/index.html",
  "permissions": [
    "activeTab",
    "tabs",
    "contextMenus",
    "storage",
    "https://api-dev.museapp.com/",
    "https://api.museapp.com/",
    "http://127.0.0.1:4567/"
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+S",
        "mac": "Command+Shift+S"
      },
      "description": "Save to Muse"
    }
  },
  "background": {
    "scripts": [
      "library/constants.js",
      "library/muse.js",
      "background/setup.js",
      "background/contextmenu.js",
      "background/loginlauncher.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "20": "assets/images/icon_20pt.png",
      "29": "assets/images/icon_29pt.png",
      "40": "assets/images/icon_40pt.png",
      "58": "assets/images/icon_58pt.png",
      "80": "assets/images/icon_80pt.png"
    },
    "default_title": "Muse"
  },
  "icons": {
    "20": "assets/images/icon_20pt.png",
    "29": "assets/images/icon_29pt.png",
    "40": "assets/images/icon_40pt.png",
    "58": "assets/images/icon_58pt.png",
    "80": "assets/images/icon_80pt.png"
  },
  "manifest_version": 2
}