Publisher Tag Debugger is a powerful Chrome extension designed for debugging Google Ad Manager (GAM) publisher tags. This tool enables users to inspect ad slots, targeting parameters, and response information directly within the browser's side panel, making it an essential asset for digital advertisers and developers. Key features include automatic detection of ad slots through the googletag API, detailed slot analysis showing ad unit paths, sizes, and network codes, as well as a comprehensive stats dashboard that highlights filled versus empty slots.

Moreover, the extension offers a targeting inspector for examining key-value pairs at both page and slot levels, and response details that provide insights into advertiser, campaign, creative, and line item IDs for filled slots. Users can benefit from visual highlighting of slots with an animated overlay, and a dark mode that adapts to system preferences. Additionally, it is compatible with both Chrome (MV3) and Firefox (MV2), ensuring cross-browser functionality.