As a temporary workaround, you might consider adjusting the size of the vertical tab sidebar to ensure all pinned tabs are visible. However, this adjustment may not persist across sessions. Alternatively, you can monitor the progress of Bug 1954692 f...
It may be because the startup setting was accidentally removed or reset. To fix this, you can add Firefox back to the startup folder manually. Press Windows + R, type shell:startup, and press Enter. Then, copy the Firefox shortcut from your desktop a...
