Using the Tabs

Ctrl + T : for opening a new tab
Ctrl + Shift + T : for undoing the last closed tab
Ctrl + W : for closing the current tab
Ctrl + TAB : for switching between the currently opened tabs
Ctrl + Page Down : for switching to the next tab
Ctrl + Page Up : for switching to the previous tab

On Page Switching

SPACEBAR : for scrolling down the page
Shift + SPACEBAR : for scrolling up the page

Finding Text

Ctrl + F : opens the find box, type in your search term
Ctrl + G : switch to the next matched search result

Bookmarking

Ctrl + D : Bookmarks the current tab

Others

Ctrl + L : switch focus on the location bar