Examine source code of Resp Headers

{
  "manifest_version": 2,
  "name": "Resp Headers",
  "version": "1.1.2",
  "description": "View HTTP response headers for current or custom URL",
  "browser_specific_settings": {
    "gecko": {
      "id": "{6e85fdbb-f553-4078-829d-efdd57f032b9}",
      "strict_min_version": "96.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "gfx/ic16.png",
    "48": "gfx/ic48.png"
  },
  "browser_action": {
    "default_popup": "front/app.html",
    "default_icon": {
      "16": "gfx/ic16.png",
      "48": "gfx/ic48.png"
    }
  },
  "background": {
    "scripts": [
      "back/daemon.js"
    ]
  },
  "permissions": [
    "tabs"
  ]
}