[Bug]: BrowserLayout not loading when opening a new tab, homescreen shown instead

[sv-ohorvath]

*Marked as S1 because it's causing a lot of flaky tests. Please change it if it's not the appropriate label.

Steps to reproduce

Random UI tests are failing due to this, can't reproduce manually yet.
Most recent failure in visitedUrlHistoryTest - video (if you don't have access to the Firebase project, let me know )

Steps taken by the UI test:

1. Open the app
2. Enter an URL and press go.
3. Wait for the page to load.

Expected behaviour

The browser loads a new tab, showing the webpage.

Actual behaviour

The page is not displayed, but a new tab is created, according to the number shown in the tab counter.

Device name

Pixel 2 (Firebase virtual device)

Android version

Android 9

Firefox release type

Firefox Nightly

Firefox version

96.0a1

Device logs

visitedUrlHistoryTest - logcat.txt

Additional information

No response

┆Issue is synchronized with this Jira Task

[sv-ohorvath]

This is still affecting a lot of UI tests (see issue mentions linked).

[stale]

See: #17373 This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.