Examine source code of Daily Tab

{
  "manifest_version": 2,
  "name": "Daily Tab",
  "description": "Automatically opens tabs at a given time every day.",
  "version": "1.2.0",
  "permissions": [
    "alarms",
    "storage",
    "tabs"
  ],
  "homepage_url": "https://github.com/Suyooo/firefox-dailytab",
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "firefox-dailytab@suyo.be",
      "strict_min_version": "63.0a1"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "Daily Tab",
    "default_popup": "tabs.html",
    "default_icon": {
      "16": "icon.svg",
      "32": "icon.svg"
    },
    "theme_icons": [
      {
        "light": "icon-dark.svg",
        "dark": "icon.svg",
        "size": 16
      },
      {
        "light": "icon-dark.svg",
        "dark": "icon.svg",
        "size": 32
      }
    ]
  }
}