Examine source code of Mood-Tagger Playlist Web

{
  "manifest_version": 2,
  "name": "Mood-Tagger Playlist Web",
  "version": "1.0",
  "description": "Tag chill/workout/focus for playlist tracks, store locally, filter view.",
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_action": {
    "default_title": "MoodTagger",
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "moodtagger@example.com",
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}