Examine source code of Publer

{
  "manifest_version": 2,
  "name": "Publer",
  "version": "1.3.5",
  "description": "Share content across Facebook, Instagram, Twitter, LinkedIn, and all major social networks in just a few clicks",
  "background": {
    "scripts": [
      "background.bundle.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "run_at": "document_end",
      "js": [
        "contentScript.bundle.js"
      ],
      "all_frames": false
    }
  ],
  "icons": {
    "16": "favicons/favicon-16x16.png",
    "32": "favicons/favicon-32x32.png",
    "48": "favicons/favicon-48x48.png",
    "64": "favicons/favicon-64x64.png",
    "96": "favicons/favicon-96x96.png",
    "128": "favicons/favicon-128x128.png",
    "256": "favicons/favicon-256x256.png",
    "512": "favicons/favicon-512x512.png",
    "1024": "favicons/favicon-1024x1024.png"
  },
  "browser_action": {
    "default_title": "Publer"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "windows": "Ctrl+Shift+0",
        "mac": "Command+Shift+0",
        "chromeos": "Ctrl+Shift+0",
        "linux": "Ctrl+Shift+0"
      }
    }
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "webRequest",
    "storage",
    "https://app.publer.com/*"
  ],
  "web_accessible_resources": [
    "dashboard.html"
  ],
  "incognito": "not_allowed",
  "content_security_policy": "default-src 'self' https://app.publer.com; frame-src 'self' https://app.publer.com; script-src 'self'; connect-src https://app.publer.com; style-src * 'self'; img-src 'self' data:;",
  "browser_specific_settings": {
    "gecko": {
      "id": "{331ffd61-c4ac-4f3f-b120-4c266fb5a89a}"
    }
  }
}