There are dozens of useful keyboard shortcuts for browsers.
Some I use regularly (IE):
Shift + Tab: Scroll through all tabs on browser instance.
Space bar: Scroll down (amazing how many people reach for the touchpad or mouse to move the cursor to vertical scroll bar to read a webpage.) Arrow keys and Page Up and Page Down keys also get no love.
Alt + left arrow: Navigate back
Alt + right arrow: Navigate forward
Ctrl + T : Open new tab
Ctrl + K : Open duplicate tab
Ctrl + E or F4 : Navigation bar
Ctrl + F or F3 : Find on webpage
Ctrl + R or F5 : Refresh
Alt + Enter or F11: Full screen
Ctrl + D : Add as favorite
Alt + A : Open favorites list
Ctrl Shift Delete: Open Delete Browser History console
Ctrl + 0 : Reset zoom to 100%
Another key that most people don’t use is the floating menu button (right click on mouse.)
There are hundreds of keyboard shortcuts for Word and Excel. I rarely have to use my mouse.