Examine source code of Stream Recorder

{
  "name": "Stream Recorder",
  "version": "2.1",
  "manifest_version": 2,
  "description": "Firefox extension that records streams and videos.",
  "background": {
    "scripts": [
      "/src/background.js"
    ]
  },
  "browser_action": {
    "default_icon": "/icons/rec-button.svg",
    "browser_style": true,
    "default_title": "Start recording"
  },
  "icons": {
    "64": "icons/rec-button.svg"
  },
  "permissions": [
    "activeTab"
  ],
  "web_accessible_resources": [
    "/live-recorder-worker-bundle.js"
  ],
  "applications": {
    "gecko": {
      "strict_min_version": "63.0",
      "id": "{cbffb043-b77d-45a5-a4b0-d91eee52b496}"
    }
  }
}