2067076 - The Jump to Bottom button cannot be clicked and does not have any hover or pressed states

Status: ASSIGNED

(Core :: Machine Learning: Frontend, defect)

Description

[Rares Doghi, Desktop QA]

Attachment: bottom.mp4

Found in

• Nightly 156.0a1 (2026-08-26)

Affected versions

• Nightly 156.0a1 (2026-08-26)
  Beta 155.0b6

Affected platforms

• all

Preconditions
Enable Smart Window
Enable NOVA styles.

Steps to reproduce

1. Have a few follow up conversations in the Sidebar.
2. Scroll back up in the sidebar.
3. Click the Jump to button arrow.

Expected result

• The Jump to bottom button should have a hover and pressed states and the button should be clickable.

Actual result

• The Jump to bottom button is not clickable at all with Nova enabled

Regression range
N/A

Comment 1

[BugBot [:suhaib / :marco]]

The severity field is not set for this bug.
:jlevinsohn, could you have a look please?

For more information, please visit BugBot documentation.

Comment 2

[Giulia Cardieri (:giulia)]

Attachment: Bug 2067076: Add z-index and cursor pointer to jump to bottom button in chat

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/73e23aa0ccec
https://hg.mozilla.org/integration/autoland/rev/a9b498702931
Add z-index and cursor pointer to jump to bottom button in chat r=czhou

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/88fa72d2f463
https://hg.mozilla.org/integration/autoland/rev/8590488daa5e
Revert "Bug 2067076: Add z-index and cursor pointer to jump to bottom button in chat r=czhou" for causing mochitets failures in browser_smartwindow_jump_to_bottom.js.

Comment 5

[Serban Stanca [:SerbanS]]

Reverted this because it was causing mochitets failures in browser_smartwindow_jump_to_bottom.js.

• Revert link
• Push with failures
• Failure Log
• Failure line: TEST-UNEXPECTED-FAIL | browser/components/aiwindow/ui/test/browser/browser_smartwindow_jump_to_bottom.js | test_jump_to_bottom_scroll_and_click - Scroll fade should be painting so the button is actually covered - "none" != "none" - got "none", expected "none" (operator !=)

Comment 6

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/421a1bd6aa42
https://hg.mozilla.org/integration/autoland/rev/11c599294859
Add z-index and cursor pointer to jump to bottom button in chat r=czhou