Examine source code of ExactNote

{
  "name": "ExactNote",
  "version": "1.6.0",
  "description": "ExactNote is designed to create, view, and organize annotations on web pages and pdf documents.",
  "manifest_version": 2,
  "permissions": [
    "geolocation",
    "activeTab",
    "tabs",
    "storage",
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "webNavigation",
    "management"
  ],
  "icons": {
    "16": "assets/images/icon-16x16.png",
    "24": "assets/images/icon-24x24.png",
    "32": "assets/images/icon-32x32.png",
    "48": "assets/images/icon-48x48.png",
    "64": "assets/images/icon-64x64.png",
    "128": "assets/images/icon-128x128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "run_at": "document_start",
      "js": [
        "content.js",
        "runtime.js",
        "vendor.js"
      ],
      "css": [
        "assets/styles/content.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js",
      "runtime.js",
      "vendor.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "assets/images/icon-16x16.png",
      "24": "assets/images/icon-24x24.png",
      "32": "assets/images/icon-32x32.png",
      "48": "assets/images/icon-48x48.png",
      "64": "assets/images/icon-64x64.png",
      "128": "assets/images/icon-128x128.png"
    },
    "default_title": "ExactNote",
    "default_popup": "popup.html"
  },
  "web_accessible_resources": [
    "assets/images/*.png",
    "popup.html",
    "*.html",
    "index.html?page=comments",
    "index.html?page=input",
    "index.html?page=create-notepad",
    "index.html?page=sidebar",
    "index.html?page=privacy-prompt",
    "index.html?page=web-picture-annotation"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "firefox-production@exactnote.com",
      "strict_min_version": "65.0"
    }
  }
}