1572902 - Disqus escapes the Private Browsing mode

Status: UNCONFIRMED

(Firefox :: Private Browsing, defect, P3)

Description

[Bob Bib [:bobbib]]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Firefox/60.0

Steps to reproduce:

Tested/affected Firefox releases: 60.8.0esr, 68.0.1 (official Linux 64-bit binary tarballs).
Testing environment: Debian GNU/Linux 9; Linux 4.9 (amd64).

• Start Firefox in normal mode.

• Open a "Private Browsing" window.

• Inside that private window, visit any web site using Disqus comments, e.g.:
  https://blog.disqus.com/build-your-online-community-with-live-events#disqus_thread

• Scroll to the comments section (if it hasn't yet, automatically).

• Find the blue round "(D)" icon (under the "Log in with", under the "Join the discussion…") and click on it.

• A pop-up window (titled "Sign in to Disqus") should open (still in "Private Browsing" mode):
  https://disqus.com/next/login/?forum=disqus&evs=...#!auth%3Astart

• In that pop-up window, click the gray "Forgot password?" link.

Actual results:

• That pop-up window closes.

• A web page titled "Reset Password - Disqus":
  https://disqus.com/forgot/
  opens in a new tab in the main (non-private) Firefox window.

• You can close that tab; BTW, that page's not saved in the History.

Expected results:

IMHO, new tabs and windows opened by "Private Browsing" web pages should remain there in the private mode.

Comment 1

[Bob Bib [:bobbib]]

P.S. If you manually copy-paste the URL of that "Sign in to Disqus" popup into a regular "Private Browsing" window and then click "Forgot password?", it opens in a new private tab, as it probably should be.

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

The priority flag is not set for this bug.
:groovecoder, could you have a look please?

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