Add Professor Prebid user guide

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-#-------------- Prebid Identity --------------|
+- sbSecId: 8
+  title: Professor Prebid
+  link: /tools/professor-prebid.html
+  isHeader: 0
+  isSectionHeader: 0
+  sectionTitle:
+  subgroup: 0
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+ #-------------- Prebid Identity --------------|
 
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tools/professor-prebid.md

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+---
+layout: page_v2
+title: Professor Prebid
+description: Professor Prebid User Guide
+sidebarType: 8
+---
+
+# Professor Prebid User Guide
+
+## Introduction
+
+Professor Prebid is an open source Chrome extension to allow easy debugging and troubleshooting on publisher websites using Prebid.js.
+
+## Installation
+
+Simply visit the dedicated [Chrome Store link](https://chrome.google.com/webstore/detail/professor-prebid-v02/kdnllijdimhbledmfdbljampcdphcbdc) and click on `Add to Chrome`. Don't forget to pin it so you can have one-click access.
+
+Alternatively, if you want to compile it yourself and run locally, please clone Github's [repository](https://github.com/prebid/professor-prebid) and follow the instructions.
+
+## Usage
+
+Professor Prebid will automatically detect if the page has one or more Prebid instances. It Prebid is found, the extension's icon will display a badge like: ![alt_text](/assets/images/tools/professor-prebid-icon.png)
+
+Click on the icon to start interaction.
+
+### Features
+
+#### Adunits
+
+This is the default view and allows you to quickly check all the adunit codes available to Prebid, along with the associated media types and bidders. 
+
+![Professor Prebid AdUnits screen](/assets/images/tools/professor-prebid-2.png)
+
+
+Each bidder entry is clickable, showing the associated input and bid response. You can easily copy a specific part of the JSON to the clipboard.
+
+![AdUnits screen bidders detail](/assets/images/tools/professor-prebid-3.png)
+
+
+Finally, you can also spot who is the winning bidder and whether its ad was rendered.
+![AdUnits screen winning bidder](/assets/images/tools/professor-prebid-4.png)
+
+#### Bids
+
+This screen allows you to verify and compare all the bids placed via Prebid.js and their metadata including:
+
+* Bid value
+* Bid currency
+* Response time
+* Adserver Targeting keywords
+
+![Professor Prebid bids screen](/assets/images/tools/professor-prebid-5.png)
+
+#### Timeline
+
+This view shows you the auction's main milestones:
+
+* Auction start timestamp
+* Bidders calling sequence and timestamp
+* Each bidder response time
+* Timeout threshold
+* Auction end timestamp
+
+![Professor Prebid timeline screen](/assets/images/tools/professor-prebid-6.png)
+
+Professor Prebid renders different timeline views using the auction id as key. This can happen if the publisher has an auto-refresh or manages each adunit independently.
+
+#### Config
+
+You will find here the main modules and their configuration:
+
+* Price Granularity: low/medium/high/auto/dense/custom
+* Bidder settings: calling order, timeout, …
+* Prebid Server: id, bidders, endpoints, …
+* CMP: Support different compliance frameworks (TCF, CCPA...), encoded consent string, decoded consent string
+* User ID modules
+
+![Professor Prebid config screen](/assets/images/tools/professor-prebid-7.png)
+
+#### User ID
+
+This view displays the configuration and the outcome of the different id providers found on page.
+
+![Professor Prebid user ID screen](/assets/images/tools/professor-prebid-8.png)
+
+#### Tools
+
+This tab provides advanced troubleshooting tools:
+
+* Shortcut to GAM console
+* Activation of Prebid Debug data on console
+* Bid filtering: allowlist of bidders
+* Bid CPM override
+* Adunit overlay: shows details about the winner over the creative on page
+
+![Professor Prebid tools screen](/assets/images/tools/professor-prebid-9.png)
+
+Here's an example of an overlay:
+
+![Overlay example](/assets/images/tools/professor-prebid-10.png)
+
+## How can I submit a feature request ?
+
+Please open an GitHub issue on [https://github.com/prebid/professor-prebid/issues](https://github.com/prebid/professor-prebid/issues).
+
+## How can I report a bug ?
+
+Please submit a GitHub issue on [https://github.com/prebid/professor-prebid/issues](https://github.com/prebid/professor-prebid/issues) providing as much details as possible:
+* Steps to reproduce the issue
+* Example of website where you face the issue
+* Professor Prebid version
+
+## Related Reading
+- [Prebid.js troubleshooting guide](/troubleshooting/troubleshooting-guide.html)