Examine source code of ButWhyMod

{
  "manifest_version": 2,
  "name": "ButWhyMod",
  "version": "1.7",
  "applications": {
    "gecko": {
      "id": "sleepingkirby@gmail.com",
      "strict_min_version": "57.0"
    }
  },
  "description": "But why modals? Attempts to remove modals for the webpage. Allows for whitelist/ignore list of hosts that you don't want to disable modals on. Also allows for custom domain and patterns list. Also can turn off automatic removal and disable modals on a per-page basis (set to off by default as per web browser security policy). *Please be aware that some websites requires modals to work properly and not all modals are bad. Please configure to apply on the pages that you truly want this on.*",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "icons": {
    "96": "icons/icon-96.png"
  },
  "browser_action": {
    "default_icon": "icons/icon-96.png",
    "default_title": "But Why Modal?",
    "default_popup": "popup/menu.html"
  },
  "options_ui": {
    "page": "options/settings.html",
    "browser_style": true,
    "chrome_style": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "./content_scripts/butWhyMod.js"
      ]
    }
  ]
}