Examine source code of Anti-Doomscroll

{
  "manifest_version": 2,
  "name": "Anti-Doomscroll WebExtension",
  "version": "0.1.1",
  "description": "This extension warns you when you visit websites you've marked as time-wasters.",
  "default_locale": "en",
  "permissions": [
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "dist/background_scripts/background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "dist/content_scripts/content.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "icons/shield-48.png",
    "default_popup": "src/popup/popup.html"
  },
  "icons": {
    "16": "icons/shield-16.png",
    "48": "icons/shield-48.png",
    "128": "icons/shield-128.png"
  },
  "applications": {
    "gecko": {
      "id": "anti-doomscroll@example.com"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "anti-doomscroll@example.com",
      "strict_min_version": "42.0"
    }
  }
}