The F12 console does not work in the extension's content script which running on 'document_start'

Confirmed Issue #12251966 • Assigned to Mike J.


Cool C.
Jun 6, 2017
This issue is public.
Found in
  • Microsoft Edge
Found in build #
Reported by 1 person

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Steps to reproduce

See the attached file ‘screencast.mp4’ to reproduce the issue.

  1. open attached extension and add them to the edge 15.
  2. navigate to
  3. press F12
  4. reload the page (press F5)
  5. see F12 console

***** Expected *****

console must contain 3 infos “CoolCmd” and 3 errors "SCRIPT5009: ‘fkghdkfghdfkjghdfkgjhdfjkghdfj’ is undefined".

***** Actual *****

console only contain 2 infos “CoolCmd” (on my hardware).
first “” throws exception, but this exception does not reach the console. is 'heavy’. on a ‘lighter’ site these bugs do not appear.


Comments and activity

  • Changed Steps to Reproduce

  • sometimes generates error “SCRIPT257: Could not complete the operation due to error 80020101.”

  • Microsoft Edge Team

    Changed Assigned To to “James M.”

  • Hello,

    Thank you for providing this information about the issue. After thorough testing, we are unable to reproduce this problem in Edge with the information at hand. Please update this case when you can provide more details, such as screenshots of the console errors or
    elaborate on the exact 3 infos and 3 errors we should see. It is also important that the expected results can be produced in a different browser.

    Best Wishes,
    The MS Edge Team

  • Changed Steps to Reproduce

  • I added a file ‘screencast.mp4’ to reproduce the issue.

  • Please do not test on an Intel Xeon, use the “office computer” or notebook. :)

  • Microsoft Edge Team

    Changed Assigned To to “Akshay P.”

    Changed Assigned To to “Sebastian P.”

    Changed Assigned To to “Leo L.”

    Changed Assigned To from “Leo L.” to “Paolo S.”

    Changed Status to “Confirmed”

    Changed Status from “Confirmed” to “In progress”

    Changed Assigned To from “Paolo S.” to “Mike J.”

    Changed Status from “In progress” to “Confirmed”

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