Examine source code of Nimbus Screen Capture: Screenshot, Edit, Annotate

{
  "manifest_version": 2,
  "name": "Nimbus Screen Capture: Screenshots, Annotate",
  "description": "Screen Capture FULL Web page or any part. Edit screenshots. Upload to Nimbus, Slack, Google Drive",
  "version": "15.6.9",
  "short_name": "screen capture",
  "default_locale": "en",
  "homepage_url": "https://nimbusweb.me",
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "incognito": "spanning",
  "options_ui": {
    "page": "options.html"
  },
  "background": {
    "page": "background.html"
  },
  "browser_action": {
    "default_icon": {
      "16": "images/icons/16x16.png",
      "48": "images/icons/48x48.png",
      "128": "images/icons/128x128.png"
    },
    "default_popup": "popup.html",
    "default_title": "Nimbus Capture"
  },
  "icons": {
    "16": "images/icons/16x16.png",
    "48": "images/icons/48x48.png",
    "128": "images/icons/128x128.png"
  },
  "content_scripts": [
    {
      "js": [
        "js/lib/jquery-3.3.1.js",
        "js/content-core.js",
        "js/content-hotkeys.js",
        "js/content-automation.js",
        "js/content-video-editor.js",
        "js/content-video-panel.js",
        "js/content-camera.js"
      ],
      "css": [
        "css/flex.min.css",
        "css/icons.min.css",
        "css/video-panel.min.css"
      ],
      "matches": [
        "<all_urls>"
      ],
      "exclude_matches": [
        "http://*/*xml"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "<all_urls>",
    "downloads",
    "tabs",
    "activeTab",
    "storage",
    "unlimitedStorage",
    "contextMenus",
    "clipboardRead",
    "clipboardWrite",
    "notifications"
  ],
  "web_accessible_resources": [
    "favicon.png",
    "print.html",
    "blank.html",
    "fonts/*",
    "images/*",
    "css/*",
    "js/*"
  ],
  "applications": {
    "gecko": {
      "id": "nimbusscreencaptureff@everhelper.me",
      "strict_min_version": "51.0"
    }
  }
}