Ring a ton - A Messenger ringtone customizer

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Ring a ton - A Messenger ringtone customizer",
  "description": "Choose what you want to hear when your friends text you",
  "version": "0.1.0",
  "icons": {
    "16": "assets/icons/favicon16.png",
    "48": "assets/icons/favicon48.png",
    "128": "assets/icons/favicon128.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "assets/icons/favicon.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "unlimitedStorage"
  ],
  "web_accessible_resources": [
    "styles.css",
    "assets/sounds/gem.mp3",
    "assets/sounds/level_up.mp3",
    "assets/sounds/info.mp3",
    "assets/sounds/magical1.mp3",
    "assets/sounds/magical2.mp3",
    "assets/sounds/smartphone.mp3",
    "assets/sounds/water_drop.mp3"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.facebook.com/*",
        "https://*.messenger.com/*"
      ],
      "js": [
        "content.js"
      ],
      "all_frames": true
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}