Examine source code of TokenBear

{
  "description": "A simple way to copy Bearer tokens (and other Authorization header values). The extensions adds a new panel to the Developer tools, that shows all requests with the 'Authorization' header and the header value. Also a 'Copy' button for easy copying.",
  "manifest_version": 2,
  "name": "TokenBear",
  "version": "1.1",
  "author": "Nejc P.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [],
  "devtools_page": "devtools/devtools-page.html",
  "browser_specific_settings": {
    "gecko": {
      "id": "{53ff6152-1b3c-45e0-ac25-6ff7fd0efd8f}"
    }
  }
}