Examine source code of TubeSpanner

{
  "author": "Agile451",
  "manifest_version": 2,
  "name": "TubeSpanner",
  "short_name": "TubeSpanner",
  "homepage_url": "https://www.tubespanner.com/",
  "description": "Productivity toolkit for YouTube creators. Plan, draft, refine and promote your videos without leaving the tab.",
  "version": "6.2.1",
  "icons": {
    "16": "icons/icon_16.png",
    "19": "icons/icon_19.png",
    "32": "icons/icon_32.png",
    "38": "icons/icon_38.png",
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon_16.png",
      "19": "icons/icon_19.png",
      "32": "icons/icon_32.png"
    },
    "default_title": "TubeSpanner"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+Shift+D"
      },
      "description": "Open extension's popup to access tools."
    }
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "options_page": "html/options.html",
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "lib/js/jquery.min.js",
        "lib/js/fabric.min.js",
        "lib/js/vimeoPlayer.js",
        "lib/js/TSEmojiPicker.js",
        "lib/js/makeElementDraggable.js",
        "lib/js/sketch.js",
        "lib/js/googleOneTap.js",
        "lib/js/linkify.min.js",
        "lib/js/linkify-html.min.js",
        "lib/js/linkify-string.min.js",
        "lib/js/canvas2video.js",
        "js/content.js"
      ],
      "css": [
        "lib/css/TubespannerEditor.css",
        "lib/css/TubespannerColorPicker.css",
        "lib/css/TSEmojiPicker.css",
        "css/content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "permissions": [
    "tabs",
    "storage",
    "cookies",
    "activeTab",
    "contextMenus",
    "webNavigation",
    "<all_urls>"
  ],
  "web_accessible_resources": [
    "lib/js/browserExtensionCheckScript.js",
    "lib/js/jquery.min.js",
    "lib/js/fabric.min.js",
    "lib/js/makeElementDraggable.js",
    "lib/js/tubespanner-page-drawer.js",
    "lib/js/tubespanner-page-magnifier.js",
    "js/login.js",
    "assets/images/*",
    "fonts/*",
    "css/content.css"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self';",
  "browser_specific_settings": {
    "gecko": {
      "id": "{daf1e27e-ea4f-4e06-b11a-c8b57954da9b}"
    }
  }
}