Examine source code of TimerForge

{
  "manifest_version": 2,
  "name": "TimerForge",
  "version": "1.2.0",
  "description": "Removes file and external link timers and makes downloading zips easier from curseforge.",
  "icons": {
    "48": "icons/48x48.png",
    "96": "icons/96x96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.curseforge.com/*"
      ],
      "js": [
        "timerforge.js"
      ]
    }
  ]
}