I found that hotkeys / shortcut was very useful. But sometimes we just don't care for it Here are some hotkeys / shortcuts in firefox i frequently used. I hope it can saves your time -:) :
Ctrl-W or Ctrl-F4 (Close Tab)
Instead of click red icon on the tab, just pres Ctrl-w.
Ctrl-Tab (Move to next Tab)
Move to the next tab use Ctrl-tab without using your mouse.
Ctrl-Shift-Tab (Move to previous Tab)
Move to the previous tab…
Ctrl-Shift-T (Undo Close Tab)
You can visit closed tab again…
Alt-D (Select Address Bar)
Alt-d and type the address..
Ctrl-K (Select Search Bar)
Like Alt-d, but this select search bar.
Ctrl-D (Bookmark current tab)
I think most of you known this hotkey
Ctrl-Shift-D (Bookmark all tabs)
Tired bookmark all tabs one by one, try this hotkey.
Ctrl-F (Search Word)
Maybe this is the most keyboard hotkeys that i used. It is very useful to find a word in a webpage.