Here are some shortcuts that you can use in Firefox. If you remember the shortcuts below may accelerate the course "work" when you use Firefox.
Ctrl + F
Displaying the search box (at the bottom)
Alt-N
Do a search next
ESC
Close search box
Ctrl + D
bookmark site
Ctrl + Q
Opening a new tab
Ctrl + K
Go search box
Ctrl + G
The address bar
Ctrl + =
Enlarge font size
Ctrl + --
Reduce font size
Ctrl + W
Close tab
F5
Refresh web page
Spacebar
Scrolling down the page to
Shift + Spacebar
Roll up to the top of the page