Examine source code of Erase distractions

{
  "manifest_version": 2,
  "name": "Erase distractions",
  "version": "0.0.5",
  "icons": {
    "16": "assets/icons/16w.png",
    "32": "assets/icons/32w.png",
    "48": "assets/icons/48w.png",
    "128": "assets/icons/128w.png"
  },
  "description": "Erase elements of any webpage in just one click. Less addictions, more focus",
  "homepage_url": "https://github.com/davidfurlong/erase-distractions",
  "short_name": "Erase distractions",
  "permissions": [
    "activeTab",
    "storage",
    "http://*/",
    "https://*/"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "author": "davidfurlong",
  "browser_action": {
    "default_icon": "assets/icons/48w.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "background": {
    "scripts": [
      "js/background.bundle.js"
    ]
  },
  "web_accessible_resources": [
    "js/*",
    "*.html",
    "css/*"
  ]
}