The FB Pixel Helper is a troubleshooting tool that helps you validate your FB Conversion and Custom Audience Pixels.
The Pixel Helper works in the background to automatically review the websites you browse for code that looks like a FB marketing pixel. When a website has a FB pixel installed the </> icon will turn blue and a small badge will appear indicating the number of pixels found on the page.
If the icon does not turn blue then there are no Facebook pixels installed on this page.
Click the </> icon and a small popup will appear with useful information for debugging your pixel implementation.