Examine source code of Parsimony SOPbox

{
  "manifest_version": 2,
  "name": "Parsimony SOPbox",
  "version": "1.2.7",
  "description": "The Parsimony SOPbox™ extension assists with loading, browsing, and viewing Standard Operating Procedures for tasks across websites.",
  "homepage_url": "https://parsimony.com/sopbox",
  "author": "Parsimony LLC",
  "permissions": [
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "96": "icons/96.png",
    "128": "icons/128.png"
  },
  "browser_action": {
    "default_title": "Parsimony SOPbox",
    "default_icon": {
      "19": "icons/19.png",
      "38": "icons/38.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/content-script.js"
      ]
    }
  ],
  "content_security_policy": "script-src 'self' ; object-src 'self'"
}