Examine source code of flashkill

{
  "manifest_version": 2,
  "name": "flashkill",
  "description": "Diese Extension soll den Umgang mit der 99Damage Homepage erleichtern.",
  "version": "1.3.16",
  "background": {
    "scripts": [
      "thirdParty/uint64.js",
      "thirdParty/jquery-3.4.0.min.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://liga.99damage.de/*"
      ],
      "js": [
        "content/content.js"
      ]
    },
    {
      "matches": [
        "https://liga.99damage.de/leagues/teams/*-*"
      ],
      "js": [
        "thirdParty/jquery-3.4.0.min.js",
        "thirdParty/jquery.dataTables.js",
        "thirdParty/tooltipster.bundle.min.js",
        "thirdParty/jquery.multiselect.js",
        "content/team-page/members/index.js"
      ],
      "css": [
        "thirdParty/jquery.multiselect.css",
        "thirdParty/tooltipster.bundle.min.css"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "https://open.faceit.com/data/v4/players?game=csgo&game_player_id=*",
    "https://flashkill.smatify.com/api/team/*",
    "https://steamcommunity.com/profiles/*",
    "https://liga.99damage.de/*",
    "storage",
    "unlimitedStorage"
  ],
  "web_accessible_resources": [
    "LICENSE-DETAILS.txt"
  ]
}