2059864 - [a11y] Resizing the viewport causes horizontal scrolling in about:addons

Status: RESOLVED FIXED

(Toolkit :: Add-ons Manager, defect, P2)

Description

[Claire Joeckel]

Attachment: Screenshot 2026-07-31 143157.png

Impacted Section/Element

About:addons ("Extensions", "Themes")

Steps to Reproduce

Resize the window to 1280px wide and use Ctrl + to zoom to 400%.

Expected Behavior

Content reflows neatly and adapts to window size, with no horizontal scrolling required.

Actual Behavior

On "Extensions", as zoom level is increased to 260% zoom or above, content overflows the window and horizontal scrolling is required. On "Themes" at 170% zoom or above, content overflows the window and horizontal scrolling is required.

User Impact

Users who zoom content via Ctrl + may experience difficulty using the page.

WCAG 2.2 References

1.4.10 Reflow

Recommendations

Use responsive CSS so that content reflows neatly and does not require horizontal scroll.

Testing Environment

Windows 11

Assistive Technology Used

Any

Further Reference

https://webaim.org/techniques/reflow/

Severity

3-Moderate

Comment 1

[Sarah Clements [:sclements] | PTO until Sept 8th]

Luca, does your team own this page?

Comment 2

[Luca Greco [:rpl] [:luca] [:lgreco]]

(In reply to Sarah Clements [:sclements] from comment #1)

Luca, does your team own this page?

yes, we do. I'll take a look into this.

Comment 3

[Luca Greco [:rpl] [:luca] [:lgreco]]

Attachment: Bug 2059864 - [a11y] Tweak about:addons page and card layout to be responsive and stay usable on high zoom levels.

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/4945dc8f1767
https://hg.mozilla.org/integration/autoland/rev/c3cae651cc94
[a11y] Tweak about:addons page and card layout to be responsive and stay usable on high zoom levels. r=desktop-theme-reviewers,sfoster

Comment 5

[Serban Stanca [:SerbanS]]

https://hg.mozilla.org/mozilla-central/rev/c3cae651cc94

Comment 6

[BugBot [:suhaib / :marco]]

Since nightly and release are affected, beta will likely be affected too.
For more information, please visit BugBot documentation.

Comment 7

[BugBot [:suhaib / :marco]]

The patch landed in nightly and beta is affected.
:rpl, is this bug important enough to require an uplift?

• If yes, please nominate the patch for beta approval.
  • See https://wiki.mozilla.org/Release_Management/Requesting_an_Uplift for documentation on how to request an uplift.
• If no, please set status-firefox156 to wontfix.

For more information, please visit BugBot documentation.

Comment 8

[Luca Greco [:rpl] [:luca] [:lgreco]]

The about:addons page layout was already not responsive for a long time, and given that we had to apply quite a few changes to the aboutaddons css to get it to handle smaller width and height page sizes I feel it would be good to leave it to get some more backing time in Nightly and Beta channels.