Examine source code of Task Timer

{
  "manifest_version": 2,
  "name": "__MSG_appName__",
  "description": "__MSG_appDesc__",
  "version": "3.10.6",
  "default_locale": "en",
  "offline_enabled": true,
  "permissions": [
    "alarms",
    "storage"
  ],
  "web_accessible_resources": [
    "style/images/icon-64.png"
  ],
  "icons": {
    "16": "style/images/icon-16.png",
    "64": "style/images/icon-64.png",
    "128": "style/images/icon-128.png"
  },
  "background": {
    "scripts": [
      "scripts/background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": {
      "16": "style/images/icon-16.png",
      "64": "style/images/icon-64.png",
      "128": "style/images/icon-128.png"
    },
    "default_title": "__MSG_appName__"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5f590989-34a7-4c7a-b219-5de25a64db43}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}