2058014 - The New chat, Chat history and More Buttons from the New tab AI chat are barely visible with blurred text underneath

Status: VERIFIED FIXED

(Core :: Machine Learning: Frontend, defect)

Description

[Rares Doghi, Desktop QA]

Attachment: Newchat.png

Found in

• Nightly 155.0a1 (2026-07-26)

Affected versions

• Nightly 155.0a1 (2026-07-26)

Affected platforms

• all

Preconditions
set browser.nova.enabled - true

Steps to reproduce

1. Enable Smart Window and open a new tab.
2. Ask the Assistant anything that would provide enough content to scroll through.

Expected result

• The new Chat, Chat history and More buttons should be visible on the new Tab page when there is blurred text underneath.

Actual result

• The buttons are barely visible in situations where the text is scrolled behind the buttons.
• Please note that this feature is implemented with Bug 2051361

Regression range
N/A

Comment 1

[Yulia Popova]

Attaching an example of show it should be. Here is also the Figma link https://www.figma.com/design/75Z1LtkCEUJWCxoY2KyNHv/Smart-Window-Q2?node-id=10611-131844&t=fTFeWLziTGpLZK3D-4

Comment 2

[Yulia Popova]

Attachment: Blur

Comment 3

[Chloe Zhou [:chloezhou]]

Attachment: Bug 2058014 - fullpage Smart Window top fade and non-Nova chat-history button theming. r=gcardieri

• Send the AI window mode (sidebar/fullpage) to the chat content over the actor and reflect it as a mode attribute so styles can target fullpage.
• Add fullpage-only top blur/scrim fade; the scrim is Nova-only since non-Nova buttons carry their own background.
• Theme the non-Nova ghost chrome buttons (fullpage New chat / Chat history / More, sidebar "...", New chat, Close) in dark mode
• Show each chat's most recent non-about: page favicon in the history menu.

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/d8a6fae09cac
https://hg.mozilla.org/integration/autoland/rev/b95f18eb61c5
fullpage Smart Window top fade and non-Nova chat-history button theming. r=gcardieri

Comment 5

[Sebastian Hengst [:aryx] (needinfo me if it's about an intermittent or backout)]

https://hg.mozilla.org/mozilla-central/rev/b95f18eb61c5

Comment 6

[Phabricator Automation]

firefox-beta Uplift Approval Request

• User impact if declined/Reason for urgency: On the New Tab AI chat (Smart Window, browser.nova.enabled), the New chat, Chat history, and More buttons are barely visible when scrolled content passes underneath them, making them hard to see and use. Without this fix, the fullpage chat has no top fade/scrim to separate the buttons from scrolling text.
• Code covered by automated testing?: no
• Fix verified in Nightly?: yes
• Needs manual QE testing?: no
• Steps to reproduce for manual QE testing:
• Risk associated with taking this patch: low
• Explanation of risk level: The change is scoped to the Smart Window / AI chat UI. It is limited to CSS/theming, a fullpage-only top blur/scrim fade, plumbing the AI window mode (sidebar/fullpage) to the chat content as a mode attribute, and showing favicons in the history menu. No changes to core browser behavior.
• String changes made/needed?: none
• Is Android affected?: no

Comment 7

[Chloe Zhou [:chloezhou]]

Attachment: Bug 2058014 - fullpage Smart Window top fade and non-Nova chat-history button theming.

• Send the AI window mode (sidebar/fullpage) to the chat content over the actor and reflect it as a mode attribute so styles can target fullpage.
• Add fullpage-only top blur/scrim fade; the scrim is Nova-only since non-Nova buttons carry their own background.
• Theme the non-Nova ghost chrome buttons (fullpage New chat / Chat history / More, sidebar "...", New chat, Close) in dark mode
• Show each chat's most recent non-about: page favicon in the history menu.

Original Revision: https://phabricator.services.mozilla.com/D316368

Comment 8

[Pulsebot]

https://github.com/mozilla-firefox/firefox/commit/8813180101fc
https://hg.mozilla.org/releases/mozilla-beta/rev/f0db726f7735

Comment 9

[Rares Doghi, Desktop QA]

Verified as fixed in our latest Beta 154.0b10 and our latest Nightly 155.0a1 (2026-08-11)