Examine source code of Bug Bounty Header Mod

{
  "manifest_version": 2,
  "name": "Bug Bounty Header Mod",
  "version": "1.0",
  "description": "Persistent Header Modifier",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Header Modifier"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5a5ed2f9-7cb9-4530-bea2-6ddd019c37d3}"
    }
  }
}