Examine source code of Jira Notifier

{
  "homepage_url": "https://github.com/senorsunday/JiraNotifier",
  "name": "Jira Notifier",
  "description": "Notifies you of any new tickets in your queue and when tickets you're assigned to change.",
  "version": "2018.8.2.2resigned1",
  "icons": {
    "16": "Public/Icons/favicon.svg",
    "32": "Public/Icons/favicon.svg",
    "64": "Public/Icons/favicon.svg",
    "128": "Public/Icons/favicon.svg"
  },
  "manifest_version": 2,
  "background": {
    "page": "Background/index.html"
  },
  "browser_action": {
    "default_title": "Jira Notifier",
    "default_popup": "Background/Settings/toolbar.html",
    "browser_style": false,
    "default_icon": {
      "16": "Public/Icons/favicon.svg",
      "32": "Public/Icons/favicon.svg",
      "64": "Public/Icons/favicon.svg",
      "128": "Public/Icons/favicon.svg"
    }
  },
  "options_ui": {
    "page": "Background/Settings/settings.html",
    "browser_style": false
  },
  "applications": {
    "gecko": {
      "id": "jira_notifier@github.com"
    }
  },
  "web_accessible_resources": [
    "Public/*/*"
  ],
  "permissions": [
    "*://*/*",
    "storage",
    "tabs",
    "notifications",
    "alarms"
  ]
}