Tabs and layout lost after restarting Firefox
Tabs, groups and tree layout vanish or reset after Firefox restarts or closes, sometimes losing many tabs.
Tier I · Proven The best-established problems.
15 public reports · first reported 8 June 2020 · last reported 1 June 2026
What's going wrong
Users of the Sidebery sidebar add-on often report that closing or restarting Firefox wipes out their open tabs, tab groups, tree structure, and pinned tabs.
AI-assisted: written with the help of AI from the reports. The idea report has the full summary.
In the idea report
- The full summary.
- The products the 15 reports are about, and how many came each month.
- Related problems.
No business has been found with this problem yet, so the report has no contacts. All sales are final — no refunds. Pricing.