Examine source code of Better Stake for Firefox

{
  "name": "Better Stake For Firefox",
  "version": "1.0.85",
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "https://stake.com/*",
        "https://stake.bet/*",
        "https://stake.games/*",
        "https://staketr.com/*",
        "https://Staketr2.com/*",
        "https://Staketr3.com/*",
        "https://Staketr4.com/*",
        "https://Staketr5.com/*",
        "https://Stake.bz/*",
        "https://Stake.jp/*",
        "https://Stake.ac/*",
        "https://Stake.icu/*",
        "https://Stake.us/*"
      ],
      "js": [
        "/js/external/jquery.js",
        "/js/external/jquery-ui.js",
        "/js/external/jquery.nice-number.js",
        "/js/external/SimpleSwitch.js",
        "/js/external/arrive.js",
        "/js/main/objects.js",
        "/js/main/templates.js",
        "/js/main/constants.js",
        "/js/shared/extensions.js",
        "/js/shared/utility.js",
        "/js/main/contentscripts/soundbutton.js",
        "/js/main/contentscripts/main.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://static-live.hacksawgaming.com/*",
        "https://*.sidetechnology.co/hive/b2c/game/*",
        "https://*.redtiger.cash/softswiss2/launcher/*",
        "https://*.playngonetwork.com/casino/*",
        "https://cf-iomeu-cdn.relaxg.com/casino/*",
        "https://play-rghr.igplatform.net/agg_plus_public/launch/wallets/*",
        "https://cdn.igplatform.net/badges/*",
        "https://*.cloudfront.net/casino/*",
        "https://*.gahypergaming.com/rgs/views/gameart/*",
        "https://game-p1.thunderkick.com/gamelauncher/play/*",
        "https://*.relaxg.com/casino/*",
        "https://*.cloudfront.net/gameart/*",
        "https://softswiss-static.casinomodule.com/games/*",
        "https://babylonstk.evo-games.com/*",
        "https://*.pragmaticplay.net/*",
        "https://*.launcher-gg.com/static/*",
        "https://api-prod.infingame.com/bm-launch/*",
        "https://game-launcher-softswisse.isoftbet.com/*",
        "https://casino.nolimitcdn.com/loader/*",
        "https://static-common.isoftbet.com/games/html/html5/*"
      ],
      "css": [
        "/res/css/main/iframes.css"
      ],
      "js": [
        "/js/external/arrive.js",
        "/js/shared/extensions.js",
        "/js/shared/utility.js",
        "/js/main/templates.js",
        "/js/main/constants.js",
        "/js/main/contentscripts/iframes.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "storage"
  ],
  "icons": {
    "16": "/res/img/icon/app/16.png",
    "48": "/res/img/icon/app/48.png",
    "64": "/res/img/icon/app/64.png",
    "128": "/res/img/icon/app/128.png",
    "256": "/res/img/icon/app/256.png"
  },
  "commands": {
    "test-shortcut": {
      "suggested_key": {
        "default": "Ctrl+D",
        "mac": "Command+D",
        "linux": "Ctrl+D"
      },
      "description": "Disable Ctrl D"
    }
  },
  "web_accessible_resources": [
    "/res/css/main/*",
    "/res/img/icon/*"
  ],
  "browser_action": {
    "default_popup": "/res/html/popup.html",
    "default_title": "Better Stake by Gawbly"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "better-stake-firefox@gawbly.com"
    }
  }
}