Examine source code of Mindify

{
  "manifest_version": 2,
  "name": "Mindify",
  "version": "1.6",
  "description": "A simple periodic pop-up tool to instill productivity and mindfulness on the web.",
  "icons": {
    "48": "icons/mindify48.png",
    "128": "icons/mindify128.png"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/mindify48.png",
    "default_popup": "settings.html",
    "default_title": "Mindify"
  },
  "options_ui": {
    "page": "settings.html",
    "open_in_tab": true
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{de476352-facb-40b2-9af9-b90756c85159}",
      "strict_min_version": "57.0"
    }
  }
}