dev tools not detectable in chrome anymore ?

[Procyon-b]

Has anyone noticed this, or is it new?

I've just noticed this extension, tried several examples and saw boston.com behaving as described.
Then I followed to the theregister's article where a chrome bug is mentioned. In the bug report there is a link to an example. I've tried it and no difference between dev tools displayed or not.
Going back to boston.com, the site still creates its cookies despite the dev tools being opened.

uBO-extra is not installed.
Chrome 70.0.3538.110

[jspenguin2017]

Still detectable: https://output.jsbin.com/cecuzeb/

[Procyon-b]

You're correct. Your test indicate so.
Sorry for the false alarm. :)

[jspenguin2017]

A patch was merged just now that allow pausing JavaScript on a page before opening DevTools.
https://chromium-review.googlesource.com/c/chromium/src/+/1372658

[mapx-]

"Note that the console.log detection was fixed previously. There is now a way to pause the page before it has a chance to detect devtools. For that you should:

• open chrome://inspect
• select 'Pages'
• click the 'pause' link next to the page you would like to freeze."

[superpoincare]

Maybe just fixed in Chromium and yet to arrive in Chrome?

[jspenguin2017]

It's available in Chrome 73 (Dev). Also it looks like the new demo got patched.