Examine source code of Disco Mode

{
  "manifest_version": 2,
  "name": "Disco Mode",
  "version": "1.0",
  "description": "Brighten your day! Prank your friends! This funky add-on will transform website content into random colours!",
  "icons": {
    "48": "icons/DM_icon_v1_48.png",
    "96": "icons/DM_icon_v1_96.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "browser_style": true,
    "default_popup": "popup/popup.html",
    "default_icon": {
      "48": "icons/DM_icon_v1_48.png",
      "96": "icons/DM_icon_v1_96.png"
    }
  },
  "content_scripts": [
    {
      "js": [
        "main.js"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "match_about_blank": true,
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{176369c0-818a-4540-a5a3-c65386c1bdf7}"
    }
  }
}