Examine source code of LinkShort

{
  "manifest_version": 2,
  "name": "LinkShort",
  "description": "LinkShort Browser Extension will shorten the current link using LinkShort.",
  "version": "1.2",
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png",
    "256": "icon256.png"
  },
  "permissions": [
    "activeTab",
    "https://rdr.fyi/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2f2a87db-2623-4311-8cdc-fe62b449e177}"
    }
  }
}