Examine source code of Tero Tabs

{
  "manifest_version": 2,
  "name": "Tero Tabs",
  "short_name": "Tero Tabs",
  "version": "1.0.0",
  "description": "Customize your new tab page so you can fight climate change while browsing the web. Save trees by doing what you do every day.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Tero Tabs"
  },
  "chrome_settings_overrides": {
    "homepage": "index.html"
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "storage",
    "cookies",
    "*://*.opentabs.org/*"
  ],
  "optional_permissions": [
    "topSites"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{986e85db-3348-4513-b09c-a82029347943}"
    }
  }
}