Examine source code of MicroBreak

{
  "manifest_version": 2,
  "name": "MicroBreak",
  "version": "1.2resigned1",
  "author": "Sean Kim",
  "description": "Get sent a notification every 30 minutes reminding you to take a quick walk. Sitting for excessively long periods of time is a risk factor for early death.",
  "icons": {
    "48": "icons/border-48.png"
  },
  "applications": {
    "gecko": {
      "id": "thesean.kim33@gmail.com",
      "strict_min_version": "53.0"
    }
  },
  "permissions": [
    "notifications"
  ],
  "background": {
    "scripts": [
      "background-script.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}