Open Bug 1945718 Opened 13 days ago Updated 12 days ago

Tab preview freezes for several seconds when browser.tabs.hoverPreview.enabled is set to true and Tabler Icons (Web font) is loaded from a CDN

Categories

(Firefox :: Page Info Window, defect)

Firefox 134
x86_64
Windows 11
defect

Tracking

()

UNCONFIRMED

People

(Reporter: kitamura, Unassigned)

Details

Attachments

(1 file)

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:134.0) Gecko/20100101 Firefox/134.0
Firefox for Android

Steps to reproduce:

Windows 11, Firefox 134.0.2

  1. Enter about:config in the address bar.
  2. Set browser.tabs.hoverPreview.enabled to true.
  3. Open a web page that includes the Tabler Icons CDN.
  4. Switch to another tab, then hover over the tab to display the preview.

Freezing has become more noticeable in newer versions of Tabler Icons.

A. Version that causes a several-second freeze:
https://cdn.jsdelivr.net/npm/@tabler/icons-webfont@3.29.0/dist/tabler-icons.min.css

B. Version where the freeze is shorter:
https://cdn.jsdelivr.net/npm/@tabler/icons-webfont@3.11.0/dist/tabler-icons.min.css

Actual results:

The preview freezes for several seconds.

Expected results:

The preview should be displayed smoothly without any freezing.

The Bugbug bot thinks this bug should belong to the 'Fenix::Tabs' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Component: Untriaged → Tabs
Product: Firefox → Fenix
Component: Tabs → Page Info Window
OS: Unspecified → Windows 11
Product: Fenix → Firefox
Hardware: Unspecified → x86_64
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