I'm trying to setup group policy for Google Chrome (http://support.google.com/installer/bin/answer.py?hl=en&answer=146164) particularily I'm working on setting up the Configuring the list of force-installed extensions. I can find the extension ID by looking in tools-extensions in Google Chrome but I cannot find the update URL for extensions like Adblock or Google Mail Checker, where would I find these?


I can't help you with group-policy, but each extension includes its update URL in manifest.json.

So, for the current version of adblock (id: gighmmpiobklfepjocnamgkkbiglidom):

%USERPROFILE%\AppData\Local\Google\Chrome\User Data\Default\Extensions\gighmmpiobklfepjocnamgkkbiglidom\2.5.14_0\manifest.json


"update_url": "http://clients2.google.com/service/update2/crx"

The extension will query that URL for updates, as per the documentation.

We can therefore construct a URL that will return the update XML from the above URL (just change the ID as needed) - for adblock:


The XML that is returned reads:

<?xml version="1.0" encoding="UTF-8"?>
<gupdate xmlns="http://www.google.com/update2/response" protocol="2.0" server="prod">
    <daystart elapsed_seconds="49387"/>
    <app appid="gighmmpiobklfepjocnamgkkbiglidom" status="ok">
        <updatecheck codebase="http://clients2.googleusercontent.com/crx/download/OAAAAFpzXu4buuGNADfzIKiz34SLARZdBLiXQ2zo50sAlzoBpEz77foH-XT3yHpPureXtHcQSYU2z4ZNstiuKJi-LD8AxlKa5VgufvySdIb5b9U333P0upRk1YPb/extension_2_5_14.crx" hash="" size="529317" status="ok" version="2.5.14"/>

We are interested in the codebase attribute of updatecheck, which provides us the direct URL to the latest CRX file.

  • Hi, thanks for this update url, but it looks a bit like retro-engeenering. Do you know if there is any specification for creating a custom entreprise update url endpoint? The linked documentation does not seem related anymore and I can't find anything online on this subject :( – Sebastien Lorber Mar 13 '18 at 12:25

The accepted answer is right. To save you the hassle of searching on Linux, the folder is at


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