Examine source code of UI Collabo Screen Capture

{
  "manifest_version": 2,
  "name": "UI Collabo Screen Capture",
  "version": "1.0.3",
  "description": "Screen Capture for UI Collabo",
  "icons": {
    "48": "uicollabo-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://uicollabo.com/*",
        "https://*.uicollabo.com/*",
        "https://uicollabo.work/*",
        "https://*.uicollabo.work/*",
        "https://uicollabo.net/*",
        "https://*.uicollabo.net/*",
        "http://majorui.online/*",
        "http://*.majorui.online/*",
        "https://majorui.online/*",
        "https://*.majorui.online/*"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "activeTab",
    "scripting",
    "<all_urls>",
    "browserSettings",
    "webRequest",
    "webRequestBlocking"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5cd94858-be7b-45c0-8f2d-a4fca324478b}"
    }
  }
}