Examine source code of Highlighter

{
  "manifest_version": 2,
  "name": "Highlighter",
  "version": "0.4.12",
  "browser_action": {
    "default_popup": "ui/login.html",
    "default_icon": "images/highlight-logo.png"
  },
  "background": {
    "scripts": [
      "scripts/background.js",
      "scripts/apiService.js",
      "scripts/helpers.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "scripts/contentScript.js"
      ]
    }
  ],
  "permissions": [
    "tabs",
    "contextMenus",
    "storage",
    "notifications",
    "<all_urls>",
    "https://www.highlighter.online/*",
    "http://www.localhost:3000/*"
  ],
  "icons": {
    "16": "images/highlight-logo.png",
    "48": "images/highlight-logo.png",
    "128": "images/highlight-logo.png"
  },
  "commands": {
    "save-highlight": {
      "suggested_key": {
        "default": "Alt+Shift+H",
        "mac": "Alt+Shift+H"
      },
      "description": "Save Highlight"
    }
  }
}