Examine source code of Miniflux Checker

{
  "applications": {
    "gecko": {
      "id": "miniflux-checker@addons.mozilla.org"
    }
  },
  "manifest_version": 2,
  "name": "Miniflux Checker",
  "description": "Miniflux checker",
  "version": "1.3.0",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "64": "icons/icon64.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "64": "icons/icon64.png",
    "128": "icons/icon128.png"
  },
  "options_ui": {
    "browser_style": true,
    "page": "options.html"
  },
  "permissions": [
    "alarms",
    "<all_urls>",
    "notifications",
    "storage",
    "contextMenus"
  ]
}