Examine source code of FocusBloom

{
  "manifest_version": 2,
  "name": "FocusBloom",
  "version": "0.9.0",
  "description": "Pomodoro timer combined with your brain's natural rhythm.",
  "permissions": [
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "worker/beat.js"
    ],
    "persistent": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "prof.rachristin@outlook.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/pulse.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    "aud/gen.js"
  ],
  "browser_action": {
    "default_title": "FocusBloom",
    "default_popup": "ui/dial.html"
  },
  "icons": {
    "48": "ui/mark.svg"
  }
}