Examine source code of BetterBrime

{
  "browser_action": {
    "default_icon": {
      "16": "assets/icons/16.png",
      "32": "assets/icons/32.png",
      "48": "assets/icons/48.png",
      "128": "assets/icons/128.png"
    },
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "run.js"
      ],
      "matches": [
        "*://brime.tv/*"
      ]
    }
  ],
  "description": "BetterBrime enhances Brime with new features, emotes, and more.",
  "homepage_url": "https://betterbri.me/",
  "icons": {
    "48": "assets/icons/48.png",
    "128": "assets/icons/128.png"
  },
  "manifest_version": 2,
  "name": "BetterBrime",
  "permissions": [
    "*://*.betterbri.me/*",
    "*://brime.tv/*"
  ],
  "short_name": "BB",
  "version": "1.24.5",
  "web_accessible_resources": [
    "betterbrime.min.js",
    "betterbrime.css",
    "assets/icons/*",
    "assets/fonts/*"
  ]
}