Examine source code of Wordle Backspace Fixer

{
  "manifest_version": 2,
  "name": "Wordle Backspace Fixer",
  "version": "1.0",
  "description": "Stops the backspace button from leaving the page in Firefox :)",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.nytimes.com/games/wordle/index.html"
      ],
      "js": [
        "fix.js"
      ],
      "all_frames": true
    }
  ]
}