Examine source code of Remove Reddit Promotion

{
  "manifest_version": 2,
  "name": "Remove Reddit Promotion",
  "version": "1.0",
  "description": "Hides the promotion ads from reddit page",
  "icons": {
    "16": "logo.png",
    "48": "logo.png",
    "128": "logo.png"
  },
  "browser_action": {
    "default_icon": "logo.png",
    "default_title": "Remove Reddit Promotion",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.reddit.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "permissions": [
    "storage",
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{feec920e-1743-4838-9657-7cbdfb80beac}"
    }
  }
}