On phones tab bar and opera bar takes a lot of space.
This especialy seen in landscape mode. Maybe there could be an option to disable tab bar in landscae mode?
It could disapear when turning phone to landscape and show back when tunring to portiat view.
If you do not find this option interesting maybe hiding bar feature could be improved.
Currenlty when scrolling page down bar hides after reaching about 1.5 of bar width. It should hide after reaching exacly width of the bar. Or perfectly if it would hide directly with scrolling page down.
And the other thing the page view port should be set to full phone screen - with bar hidden.
For example try seeing this page (www game):
Try using your wohole phone screen to view the page.