Examine source code of Rexmoji Plus

{
  "manifest_version": 2,
  "default_locale": "en",
  "name": "Rexmoji",
  "short_name": "Rexmoji",
  "description": "A simple extension for making your video calls less boring by adding capability of sending emojis to everyone.",
  "version": "1.3.1",
  "author": "010 Pixel",
  "permissions": [
    "storage",
    "https://meet.google.com/**-**-**",
    "https://*.zoom.us/*"
  ],
  "browser_action": {
    "default_icon": {
      "16": "images/icon16.png",
      "32": "images/icon38.png"
    },
    "default_popup": "popup.html",
    "default_title": "Rexmoji"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "all_frames": true,
      "matches": [
        "https://meet.google.com/**-**-**",
        "https://*.zoom.us/*"
      ],
      "js": [
        "js/_libs.js",
        "js/_myapp.js"
      ],
      "css": [
        "css/styles.css",
        "css/emojis.css"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "16": "images/icon16.png",
    "24": "images/icon19.png",
    "32": "images/icon38.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "web_accessible_resources": [
    "images/icons/*",
    "images/emoji/*",
    "css/styles.css",
    "css/emojis.css",
    "js/_libs.js",
    "js/_myapp.js",
    "popup.html"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b47c33e6-9b07-4ba3-bc90-648c3e63a57c}"
    }
  }
}