Examine source code of Seasons Summoning Gauge

{
  "name": "Seasons Summoning Gauge",
  "version": "0.2",
  "manifest_version": 2,
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_title": "Season Summoning Gauge"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.boardgamearena.com/archive/replay*",
        "*://*.boardgamearena.com/*/seasons?table*"
      ],
      "js": [
        "jquery-3.5.0.min.js",
        "content.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ]
}