2059917 - [Nova] Theme items slightly jiggle after scrolling in about:addons

Status: VERIFIED FIXED

(Toolkit :: Add-ons Manager, defect, P1)

Description

[Merci chao]

Attachment: 2026_08_01_15_11_29.mp4

Steps to Reproduce:

1. Open about:addons and select the Themes section.
2. Install several Nova themes.
3. Scroll through the list of themes.
4. Observe that some Nova theme items jiggle unexpectedly.

Comment 1

[Mark Striemer [:mstriemer]]

@Luca it seems like the SVG images are showing this wiggling issue

Comment 2

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

Attachment: Bug 2059917 - Fix jiggle effect while scrolling by adding preserveAspectRatio and viewBox to all bundled theme preview svg files. r?zombie,mstriemer!

Comment 3

[Alex Cornestean]

I checked the Windows and Linux builds from the Treeherder try push (https://treeherder.mozilla.org/jobs?repo=try&landoInstance=lando-prod-2025&landoCommitID=76020), which includes Luca's draft patch for this bug.

The patch successfully resolves the issue - scrolling through the list of themes no longer causes the theme cards to jiggle.

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/4add51867c5e
https://hg.mozilla.org/integration/autoland/rev/935d3458efed
Fix jiggle effect while scrolling by adding preserveAspectRatio and viewBox to all bundled theme preview svg files. r=mstriemer,desktop-theme-reviewers,zombie

Comment 5

[Atila Butkovits]

https://hg.mozilla.org/mozilla-central/rev/935d3458efed

Comment 6

[Alex Cornestean]

Verified as Fixed. Tested on the latest Nightly (156.0a1/20260820214844) under Windows 11, Ubuntu 25.10 and macOS 11.3.1.

I no longer notice any jiggle when scrolling through the list of themes in about:addons.