Examine source code of JerkMuter

{
  "manifest_version": 3,
  "name": "JerkMuter",
  "description": "A configurable ignore feature for the forum at gog.com",
  "version": "3.0.5",
  "browser_specific_settings": {
    "gecko": {
      "id": "{b5a85f9d-1054-445d-8896-1d65aad3a7e3}",
      "strict_min_version": "109.0"
    }
  },
  "content_scripts": [
    {
      "js": [
        "defaults.js",
        "jerkmuter.js"
      ],
      "matches": [
        "https://www.gog.com/forum/*"
      ]
    }
  ],
  "permissions": [
    "storage",
    "tabs"
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "action": {
    "default_popup": "jmoptions.html",
    "default_icon": "icon128.png"
  }
}