Examine source code of Speed-Pitch changer

{
  "name": "Speed-Pitch changer",
  "description": "Modify the speed with the pitch of a video or audio.",
  "version": "1.4.2",
  "manifest_version": 2,
  "browser_action": {
    "default_icon": "icons/border-48.png",
    "default_title": "Speed/Pitch changer",
    "default_popup": "popup/popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "SpeedPitch_changer@despaa.id",
      "strict_min_version": "60.0"
    }
  },
  "icons": {
    "16": "icons/border-16.png",
    "32": "icons/border-32.png",
    "38": "icons/border-38.png",
    "48": "icons/border-48.png",
    "128": "icons/border-128.png"
  },
  "background": {
    "page": "background/background.html"
  },
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "<all_urls>"
  ]
}