Examine source code of HeaderSmith – cod3rjava

{
  "manifest_version" : 2 ,
  "name" : "HeaderSmith – cod3rjava",
  "version" : "0.1.3",
  "description" : "Override request headers in Firefox.",
  "browser_specific_settings": {
    "gecko": {
      "id": "headersmith-cod3rjava@cod3rjava.local",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "applications": {
    "gecko": {
      "id": "headersmith-cod3rjava@cod3rjava.local",
      "strict_min_version": "109.0"
    }
  },
  "permissions" : [
    "storage" ,
    "webRequest" ,
    "webRequestBlocking" ,
    "<all_urls>" 
  ],
  "background" : {
    "scripts" : [
      "background/background.js" 
    ]
  },
  "browser_action" : {
    "default_title" : "HeaderSmith – cod3rjava",
    "default_popup" : "popup/popup.html"
  },
  "icons" : {
    "48" : "icons/icon.svg",
    "96" : "icons/icon.svg"
  }
}