| 392 | Sidebar closed | # Tabs | All hidden | Dummy only | All visible | |||||||||
| 406 | Open, no tabs | -1 | 392 | 392 | 392 | |||||||||
| 423 | Open, dummy hidden | 0 | 406 | 406 | 406 | |||||||||
| 466 | Open, dummy tab | 1 | 423 | 466 | 466 | |||||||||
| 477 | Dummy plus std hidden | 6 | 442 | 477 | 487 | |||||||||
| 487 | Dummy plus std visible | 28 | 603 | 514 | 638 | |||||||||
| 627 | 28 hidden | |||||||||||||
| 514 | Dummy + 27 hidden | This chart suggests that painting is dominating the cost of adding tabs for "shorter" panel lists. | ||||||||||||
| 638 | Dummy + 27 visible | |||||||||||||
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| Dummy tab src = about:blank | ||||||||||||||
| Std = Tabs for new mozilla profile | ||||||||||||||