Examine source code of ReBTRoblox - Continuing the BTRoblox legacy

{
  "manifest_version": 2,
  "name": "ReBTRoblox - Continuing the BTRoblox legacy",
  "short_name": "ReBTRoblox",
  "description": "A fork of BTRoblox that continues the original after it was abandoned, fixing the features that had stopped working.",
  "author": "nrmu9, AntiBoomz",
  "icons": {
    "32": "res/icon_32.png",
    "48": "res/icon_48.png",
    "64": "res/icon_64.png",
    "96": "res/icon_96.png",
    "128": "res/icon_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.roblox.com/*",
        "*://web.roblox.com/*",
        "*://create.roblox.com/*"
      ],
      "exclude_matches": [
        "*://*/userads/*",
        "*://*/user-sponsorship/*",
        "*://*/*/userads/*",
        "*://*/*/user-sponsorship/*"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "world": "MAIN",
      "js": [
        "js/inject.js"
      ]
    },
    {
      "matches": [
        "*://www.roblox.com/*",
        "*://web.roblox.com/*"
      ],
      "exclude_matches": [
        "*://*/userads/*",
        "*://*/user-sponsorship/*",
        "*://*/*/userads/*",
        "*://*/*/user-sponsorship/*"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "js": [
        "js/content.js"
      ]
    },
    {
      "matches": [
        "*://create.roblox.com/*"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "js": [
        "js/content.js"
      ]
    }
  ],
  "version": "4.2.2",
  "browser_action": {
    "default_title": "Open ReBTRoblox Settings",
    "default_icon": {
      "32": "res/icon_32.png",
      "48": "res/icon_48.png",
      "64": "res/icon_64.png",
      "96": "res/icon_96.png",
      "128": "res/icon_128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "btroblox@nrmu.eu",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "permissions": [
    "*://*.roblox.com/",
    "*://*.rbxcdn.com/",
    "contextMenus",
    "scripting",
    "storage"
  ],
  "web_accessible_resources": [
    "/res/*",
    "/css/*"
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ]
  }
}