Steps to reproduce

The Tab Preview is suddenly very tiny and wrongly positioned.

It might have to do with my Firefox Dev Edition version (139.0b10), but this should be fixed as 139 ain't far away from general release.

• Open Firefox in a new profile
• Install Sidebery nightly (same bug with release version)
• Activate Tab Preview
• Hover over tab

Fresh Firefox profile ofc.

Actual behavior

Screenshot didn't include the mouse cursor, but it is hovering the vg google tab.

Expected behavior

It should be the same size/position as it used to be.

System

macOS 15.5

Firefox version

139.0b10

Sidebery version

5.3.3.11 (same bug with release version btw)

Logs