Examine source code of It's Dream Time

{
  "manifest_version": 2,
  "name": "It's Dream Time",
  "version": "1.2",
  "description": "Enforce your sleep schedule by blocking browsing during specified hours. Sleep better, browse less.",
  "icons": {
    "48": "icon.svg"
  },
  "permissions": [
    "tabs",
    "storage",
    "alarms",
    "webNavigation"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.svg"
  },
  "applications": {
    "gecko": {
      "id": "its-dream-time@github.com",
      "strict_min_version": "58.0"
    }
  }
}