Found in

• Firefox 108.0b2

Affected versions

• Firefox 108.0b2
• Nightly 109.0a1
• Release 107.0

Tested platforms

• Affected platforms: Windows 10, Ubuntu 22.04 and macOS 11.6

Preconditions

• Have browser.tabs.firefox-view pref set as true if not already (it should be true by default)

Steps to reproduce

1. Go to More Tools-> Customize toolbar in the burger menu.
2. Drag any item over a tab

Expected result

• A small space is made for the item to fit after the Firefox View icon

Actual result

• A small space is made for the item to fit after the Firefox View icon by showing an ugly artifact. If the item is hovered near the right side of the Firefox View icon the blank space is created after it without any artifacts.

Regression range

• Not a regression range, it is something that also happens using an old Nightly build from 2022-05-10, close to when Firefox View feature was implemented.

Additional notes

• I'm not sure if this is intended as a notification for the users for them to know where the item will be placed, I think having a blank space just as it is when hovering over the Firefox View button itself would be enough.

This one isn't worth addressing until the pending question around button location is finalized.

(In reply to Ray Fambro from comment #1)

This one isn't worth addressing until the pending question around button location is finalized.

I think it'd be better to keep open until we know for certain so we don't lose track of it.