According to the documentation Wiki:
- When more tabs that can fit on the
view are displayed:
- if Settings ->
Preferences -> General -> Tab bar ->
Multiline is checked, several rows of
tabs will stack. Clicking on a tab
brings to the bottommost row the
whole row of tabs
- Otherwise a pair of
small buttons pointing left and right
will show, and clicking them will
move through the imaginary row of
tabs. The triangles show up and down
if the tabs are arrranged vertically.
This was definitely an SU question, not SO where they would have laughed and pointed and sent your question here.