Examine source code of Tab to GIF

{
  "name": "Tab to GIF",
  "description": "record a screen as a gif and save offline",
  "version": "1.0.0.1",
  "manifest_version": 2,
  "icons": {
    "16": "./icons/icon16.png",
    "24": "./icons/icon24.png",
    "32": "./icons/icon32.png",
    "48": "./icons/icon48.png",
    "64": "./icons/icon64.png",
    "128": "./icons/icon128.png",
    "256": "./icons/icon256.png",
    "512": "./icons/icon512.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "mt_cs.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "browser_action": {
    "default_icon": {
      "16": "./icons/icon16.png",
      "24": "./icons/icon24.png",
      "32": "./icons/icon32.png",
      "48": "./icons/icon48.png",
      "64": "./icons/icon64.png",
      "128": "./icons/icon128.png",
      "256": "./icons/icon256.png",
      "512": "./icons/icon512.png"
    },
    "default_title": "templ"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "storage",
    "tabs",
    "<all_urls>",
    "tabCapture",
    "activeTab",
    "downloads",
    "notifications"
  ],
  "web_accessible_resources": [
    "*.wasm",
    "*.js"
  ],
  "content_security_policy": "script-src 'self' 'wasm-unsafe-eval'; object-src 'self';",
  "browser_specific_settings": {
    "gecko": {
      "id": "{9ecabdc6-2378-488f-b982-82f9c3cd7e2b}"
    }
  }
}