Open Bug 1962904 Opened 8 months ago Updated 4 months ago

Firefox shows vertical tabs in new windows despite "Hide tabs and sidebar" setting

Categories

(Firefox :: Sidebar, defect, P3)

Product:
Firefox
Component:
Sidebar
Version:
Firefox 138
Type:
defect

Tracking

()

People

(Reporter: mbnuqw, Unassigned)

References

Details

(Whiteboard: [fidefe-sidebar])

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:138.0) Gecko/20100101 Firefox/138.0

Steps to reproduce:

  • Open firefox in new profile
  • Install sidebar addon (TST/Sidebery)
  • Turn on Vertical Tabs
  • Open "Customize sidebar" sidebar
  • Enable "Hide tabs and sidebar"
  • Open sidebar of installed addon
  • Resize native vertical tabs area to 0 (needed in the good repro scenario)
  • Open new window

Actual results:

Firefox always show native vertical tabs on opening new window (including browser start) despite "Hide tabs and sidebar" setting

Expected results:

No native tabs in new window

Bisected to https://bugzilla.mozilla.org/show_bug.cgi?id=1921536
Bug 1921536 - Make the SidebarState the source of truth for the current sidebar command/panel and re-open previous panel when toggling the sidebar open.

Component: Untriaged → Sidebar

I can reproduce this. It seems like when we collapse the launcher on click of "hide tabs and sidebar" and then open a new window, the state of the window opener to be adopted may not be correct.

Severity: -- → S4
Status: UNCONFIRMED → NEW
Ever confirmed: true
Priority: -- → P3
Whiteboard: [fidefe-sidebar]
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