Examine source code of Reusable Items Reminder

{
  "manifest_version": 2,
  "name": "Reusable Items Reminder",
  "description": "Get reminded to use reusable items instead of single-use products.",
  "version": "2.1",
  "permissions": [
    "activeTab",
    "storage",
    "notifications",
    "geolocation",
    "background"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "32": "icons/logo_32.png",
      "64": "icons/logo_64.png",
      "128": "icons/logo_128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "popup.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{be6a03c4-8237-4a0b-bc23-c2a09f139994}"
    }
  }
}