That button tries to navigate the main page to a new URL (aka "iframe busting") and Chrome prevents it, other browsers don't.

And why Chrome tries to open a new Tab Page during redirecting main page? Is that correct?

"in Chrome 64 all redirects originating from third-party iframes will show an infobar instead of redirecting, unless the user had been interacting with that frame.

When the user interacts with content, things can also go wrong. One example that causes user frustration is when clicking a link opens the desired destination in a new tab, while the main window navigates to a different, unwanted page. Starting in Chrome 65 we'll also detect this behavior, trigger an infobar, and prevent the main tab from being redirected."

It seems to me Chrome prevents that redirecting because of browser opens a new tab and navigates main page at the same time. But we don't create a new tab. We use only target="_top" to redirect main page from iframe.

The site tries frame-busting and when it fails it proceeds with window.open() which is blocked by default in Chrome by the popup policy.

spider@ Thanks for the issue.

Able to reproduce this issue on Windows 10, Mac OS 10.12.6 and Ubuntu 14.04 on the latest Canary 67.0.3394.0 as per the original comment.

Bisect Information:
===================
Good Build: 67.0.3381.0 (Revision - 545918)
Bad Build : 67.0.3382.0 (Revision - 546346)

On executing the per-revision bisect script, below is the Changelog URL:

https://chromium.googlesource.com/chromium/src/+log/5d97f053b583d59396b6e0a154e7ba6486871d2d..64f4e318af57a8e47a606980b86b2b593d3ad8ec

From the above Changelog, suspecting the below change:
Reviewed-on: https://chromium-review.googlesource.com/941615

japhet@ Please check and confirm if this issue is related to your change, else help us in assigning to the right owner.

Adding ReleaseBlock-Stable as this is a recent regression. Please feel free to remove if it is not applicable.

Thanks.

M67 Stable promotion is coming soon. Your bug is labelled as Stable ReleaseBlock, pls make sure to land the fix and request a merge into the release branch ASAP. Thank you.

*** Bulk Edit ***
M67 Stable promotion is coming soon. Your bug is labelled as Stable ReleaseBlock, pls make sure to land the fix and request a merge into the release branch ASAP. 

If fix is already merged to M67 and nothing else is pending, pls mark the bug as fixed. Thank you.

This feature was disabled for m67, pushing to m68

Applying "Target-68" per comment #10.

This appears to be working correctly for me in M68. Manually allowing the redirect navigates the current tab and doesn't open a new tab.

If you're still seeing this issue, please feel free to reply here and I'll take another look.

[Auto-generated comment by a script] We noticed that this issue is targeted for M-68; it appears the fix may have landed after branch point, meaning a merge might be required. Please confirm if a merge is required here - if so add Merge-Request-68 label, otherwise remove Merge-TBD label. Thanks.