Examine source code of Boardist Web Clipper

{
  "name": "Boardist Web clipper",
  "author": "Elvin Dzhavadov",
  "version": "1.4.1",
  "description": "Strengthen your experience with boardist.io",
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "permissions": [
    "identity",
    "bookmarks",
    "storage",
    "activeTab",
    "tabs"
  ],
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{f8ea2770-b163-4c7e-9a3f-84ac1650c3a7}",
      "strict_min_version": "57.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "Boardist.io",
    "default_icon": "assets/favicon-32x32.png",
    "default_popup": "popup.html"
  },
  "commands": {
    "_execute_browser_action": {
      "description": "Save to Boardist",
      "suggested_key": {
        "chromeos": "Ctrl+Shift+K",
        "linux": "Ctrl+Shift+K",
        "mac": "Command+Shift+K",
        "windows": "Ctrl+Shift+K"
      }
    }
  },
  "icons": {
    "16": "assets/favicon-16x16.png",
    "32": "assets/favicon-32x32.png",
    "128": "assets/favicon-128x128.png"
  }
}