To bring Orion's compact tabs into better visual alignment, I believe some centering work needs to be done. Currently with only one tab open, the URL bar is off-center depending on where you place your other toolbar items. Contrast this with Safari, which centers it appropriately.
Furthermore, the URL within the URL bar should be centered in the case of one tab being open.
Better alignment of elements. See attached safari screenshot for reference.
0.99.126.4.1.8-rc (WebKit 619.1.1)
Sonoma (14)