Examine source code of HN Comments

{
  "manifest_version": 2,
  "name": "HN Comments",
  "version": "0.4resigned1",
  "applications": {
    "gecko": {
      "id": "hncomments@mozilla.org",
      "strict_min_version": "45.0"
    }
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_title": "HN Comments"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "*://hn.algolia.com/*",
    "tabs"
  ]
}