Examine source code of RoPro FF

{
  "name": "RoPro FF",
  "description": "RoPro made to run on Firefox",
  "version": "1.0",
  "manifest_version": 2,
  "icons": {
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_popup": "options.html",
    "default_icon": {
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "/js/libraries/jquery-3.5.1.min.js",
        "/js/page/trade.js"
      ],
      "css": [
        "/css/page/trade.css"
      ],
      "matches": [
        "*://*.roblox.com/trades*",
        "*://*.roblox.com/*/trades*"
      ],
      "run_at": "document_start"
    },
    {
      "js": [
        "/js/libraries/jquery-3.5.1.min.js",
        "/js/page/tradePreview.js"
      ],
      "matches": [
        "*://*.roblox.com/trades*",
        "*://*.roblox.com/*/trades*"
      ],
      "run_at": "document_end"
    },
    {
      "js": [
        "/js/libraries/jquery-3.5.1.min.js",
        "/js/page/profile.js",
        "/js/page/trade.js",
        "/js/page/profileThemes.js"
      ],
      "css": [
        "/css/page/profile.css",
        "/css/page/trade.css",
        "/css/page/profileThemes.css"
      ],
      "matches": [
        "*://*.roblox.com/users/*",
        "*://*.roblox.com/*/users/*"
      ],
      "run_at": "document_end"
    },
    {
      "js": [
        "/js/libraries/jquery-3.5.1.min.js",
        "/js/page/sandbox.js"
      ],
      "css": [
        "/css/page/sandbox.css"
      ],
      "matches": [
        "*://*.roblox.com/sandbox",
        "*://*.roblox.com/*/sandbox"
      ],
      "run_at": "document_start"
    },
    {
      "js": [
        "/js/libraries/jquery-3.5.1.min.js",
        "/js/page/themes.js"
      ],
      "css": [
        "/css/page/themes.css"
      ],
      "matches": [
        "*://*.roblox.com/themes",
        "*://*.roblox.com/*/themes"
      ],
      "run_at": "document_start"
    },
    {
      "js": [
        "/js/libraries/jquery-3.5.1.min.js",
        "/js/page/quickPlay.js"
      ],
      "css": [
        "/css/page/quickPlay.css"
      ],
      "matches": [
        "*://*.roblox.com/*"
      ],
      "run_at": "document_end"
    },
    {
      "js": [
        "/js/libraries/jquery-3.5.1.min.js",
        "/js/page/additionalMenuItems.js"
      ],
      "css": [
        "/css/page/additionalMenuItems.css"
      ],
      "matches": [
        "*://*.roblox.com/*"
      ],
      "run_at": "document_start"
    },
    {
      "js": [
        "/js/libraries/jquery-3.5.1.min.js",
        "/js/page/ropro_shuffle.js"
      ],
      "css": [
        "/css/page/ropro_shuffle.css"
      ],
      "matches": [
        "*://*.roblox.com/discover*",
        "*://*.roblox.com/*/discover*"
      ],
      "run_at": "document_end"
    },
    {
      "js": [
        "/js/libraries/jquery-3.5.1.min.js",
        "/js/page/gamePage.js"
      ],
      "css": [
        "/css/page/gamePage.css"
      ],
      "matches": [
        "*://*.roblox.com/games/*",
        "*://*.roblox.com/discover*",
        "*://*.roblox.com/*/games/*",
        "*://*.roblox.com/*/discover*"
      ],
      "run_at": "document_end"
    },
    {
      "js": [
        "/js/libraries/jquery-3.5.1.min.js",
        "/js/page/groupPage.js"
      ],
      "css": [
        "/css/page/gamePage.css"
      ],
      "matches": [
        "*://*.roblox.com/groups/*",
        "*://*.roblox.com/*/groups/*"
      ],
      "run_at": "document_end"
    },
    {
      "js": [
        "/js/libraries/jquery-3.5.1.min.js",
        "/js/page/home.js"
      ],
      "css": [
        "/css/page/home.css"
      ],
      "matches": [
        "*://*.roblox.com/home*",
        "*://*.roblox.com/*/home*"
      ],
      "run_at": "document_idle"
    },
    {
      "js": [
        "/js/libraries/jquery-3.5.1.min.js",
        "/js/page/friends.js"
      ],
      "css": [
        "/css/page/friends.css"
      ],
      "matches": [
        "*://*.roblox.com/users/*/friends*",
        "*://*.roblox.com/users/friends*",
        "*://*.roblox.com/*/users/friends*",
        "*://*.roblox.com/*/users/*/friends*"
      ],
      "run_at": "document_end"
    },
    {
      "js": [
        "/js/libraries/jquery-3.5.1.min.js",
        "/js/page/avatar.js"
      ],
      "css": [
        "/css/page/avatar.css"
      ],
      "matches": [
        "*://*.roblox.com/my/avatar*",
        "*://*.roblox.com/*/my/avatar*"
      ],
      "run_at": "document_start"
    },
    {
      "js": [
        "/js/libraries/jquery-3.5.1.min.js",
        "/js/page/invite.js"
      ],
      "matches": [
        "*://*.ropro.io/join/*",
        "*://*.ropro.io/invite/*"
      ],
      "run_at": "document_end"
    },
    {
      "js": [
        "/js/libraries/jquery-3.5.1.min.js",
        "/js/page/subscription.js"
      ],
      "matches": [
        "*://*.ropro.io/subscription/*"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "notifications",
    "storage",
    "*://*.roblox.com/*",
    "*://*.ropro.io/*",
    "*://*.rbxcdn.com/*"
  ],
  "web_accessible_resources": [
    "/js/page/fetchAngular.js",
    "/js/page/fetchServers.js",
    "/js/page/fetchAvatar.js",
    "/images/*"
  ],
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "{468d95e6-e987-4c32-828f-9bf4b35efa57}"
    }
  }
}