Examine source code of OnionTree Sentinel

{
  "description": "OnionTree Sentinel is a privacy oriented, anti-phishing add-on for Tor Browser that protects you from bad .onion sites.",
  "manifest_version": 2,
  "name": "OnionTree Sentinel",
  "version": "1.1",
  "homepage_url": "https://github.com/oniontree-org/oniontree-sentinel",
  "icons": {
    "48": "icons/logo.png"
  },
  "background": {
    "page": "background.html"
  },
  "options_ui": {
    "page": "dashboard.html",
    "open_in_tab": true,
    "browser_style": false
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "icons/bird_neutral_16px.png",
      "32": "icons/bird_neutral_32px.png"
    },
    "default_popup": "popup/about.html"
  },
  "permissions": [
    "tabs",
    "storage"
  ]
}