Examine source code of better-kickbase

{
  "manifest_version": 2,
  "name": "better-kickbase",
  "version": "2.1.5",
  "description": "Sei ein effizienterer Manager mit 'better-kickbase'",
  "icons": {
    "16": "favicon/favicon-16.png",
    "48": "favicon/favicon-48.png",
    "96": "favicon/favicon-96.png",
    "128": "favicon/favicon-128.png"
  },
  "content_scripts": [
    {
      "js": [
        "assets/content_script-b61d9e06.js"
      ],
      "matches": [
        "*://play.kickbase.com/*"
      ],
      "run_at": "document_start",
      "css": [
        "src/styles/bkb.css",
        "src/styles/bundesliga.css",
        "src/styles/ligaboard.css",
        "src/styles/livematchday.css",
        "src/styles/tabelle.css",
        "src/styles/transfermarkt.css",
        "src/styles/transfermarkt-kader.css",
        "src/styles/transfermarkt-kaufen.css",
        "src/styles/transfermarkt-scouting.css",
        "src/styles/transfermarkt-verkaufen.css",
        "src/styles/_player-row.css",
        "src/styles/_frame.css",
        "src/styles/_vars.css",
        "src/styles/_fonts.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "assets/background_script-1f4bec24.js"
    ],
    "persistent": false
  },
  "web_accessible_resources": [
    "src/web_accessible_resource.js",
    "index-2fccfffa.js",
    "index-9b75122d.js",
    "src/content_script.js"
  ],
  "options_ui": {
    "page": "src/options_ui/settings.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_popup": "src/options_ui/settings.html",
    "default_icon": "favicon/favicon-48.png",
    "default_title": "better-kickbase"
  },
  "permissions": [
    "storage",
    "tabs",
    "*://play.kickbase.com/*",
    "https://raw.githubusercontent.com/FelixSchuSi/better-kickbase/price-trends-data/*"
  ],
  "externally_connectable": {
    "matches": [
      "*://play.kickbase.com/*"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "98felixss@gmail.com",
      "strict_min_version": "89.0"
    }
  }
}