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So, I noticed some other posts related to this (such as Full-page ads randomly pop up in Chrome ("Sponsored by")); however, since I have an extension that is only injecting an ad once in every 500 or so URLs, I want to know WHICH extension is causing this.

The issue is that every (random) hundred or so URLs I hit (including pages I've written myself) present an ad and create an iframe for my content. NOT OK!

However, short of process of elimination, is there a way (through DevTools or something) to see which extensions are firing?

Thanks!

Shnor W.
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2 Answers2

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In Google Chrome, you can disable each extension one at a time and determine what extension is causing the issue.

Austin
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    Yes, that's the trial-and error method (which I don't want to use, if possible) since - given the low frequency of injections, I will have to run without extensions for a long period of time to find it. – Shnor W. Jun 07 '19 at 20:34
  • What operating system are you using? Chrome has an extension activity logging mode which I think can only be accessed via a command line. – Austin Jun 07 '19 at 21:06
  • Windows 10 Build 17134 – Shnor W. Jun 07 '19 at 21:11
  • I don't know if extension activity logging will help you, but if you'd like to use it, you can enable it with the instructions on this page. The instructions in the article are for Chrome Canary, but the article is about 4 months old, so I am assuming it is available on the current stable release of Chrome. – Austin Jun 07 '19 at 21:23
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Sorry about the delay on this, but answering my own question, I found that it was not an extension, but my ISP was injecting HTML on port 80 (never happened under SSL). (BEWARE OPTIMUM USERS: in some markets, they are injecting HTML ads when you request a site). I confirmed this with Optimum and they stated that it does not violate their policies (however, they have since shut it off in my area).

Shnor W.
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