Examine source code of shitemove

{
  "manifest_version": 2,
  "name": "shitemove",
  "description": "This extension replaces estate agent clichés with something a little more truthful.",
  "version": "0.1.3resigned1",
  "author": "Angry Flat Cap",
  "background": {
    "scripts": [
      "getsettings.js",
      "dictionary.js",
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "strict_min_version": "48.0",
      "id": "{33f485e9-2b6f-48cf-8341-342b348f96c5}"
    }
  },
  "icons": {
    "16": "icons/house-16.png",
    "32": "icons/house-32.png",
    "48": "icons/house-48.png",
    "128": "icons/house-128.png",
    "256": "icons/house-256.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/house-disabled-16.png",
      "32": "icons/house-disabled-32.png",
      "48": "icons/house-disabled-48.png",
      "128": "icons/house-disabled-128.png",
      "256": "icons/house-disabled-256.png"
    },
    "default_popup": "popups/off.html"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ]
}