In OSX, you can browse tabs in browsers by Ctrl+ N/p or similar. I have not found any keys in Ubuntu 14.04.
How can you browse tabs of browsers by keyboard in Ubuntu?
In Chrome and Firefox both we have to press Ctrl+ Number
E.g. If you want to go to the tab then you have to press Ctrl+3
You can also use Alt instead of Ctrl - i.e. Alt+3.
Most shortcuts in other systems also apply:
Ctrl + TAB = next tab
Ctrl + Shift + TAB = previous tab
Ctrl + T = new tab
Ctrl + W = close tab
Ctrl + Shift + T = reopen last closed tab
In addition to the answers already given: Ctrl+PgUp and Ctrl+PgDn should also work to switch tabs forth and back.
You can find full list of shortcuts for Chrome here
Worth to mention from the list (which wasn't mentioned here yet):
Jump to the last tab Ctrl + 9