It's worth getting to know the pentadactyl/vimperator shortcuts or maps as they, arguably, offer better functionality. For e.g. the normal mode keymap
o offers the equivalent of the firefox
Ctrl-O combined - which is to say, smart completions (of bookmarks, locations, history, etc) are offered to you for tab completion.
But to answer your question - you can define some custom mappings in your
:help pentadactylrc for where yours is located) to offer you the firefox style shortcuts. For e.g.
" Normal Mode Mappings
nnoremap <C-f> /
nnoremap <C-w> :tabclose<CR>
nnoremap <C-c> <C-v><C-c>
nnoremap <C-v> <C-v><C-v>
nnoremap <C-x> <C-v><C-x>
" Insert Mode Mappings
inoremap <C-c> <C-v><C-c>
inoremap <C-v> <C-v><C-v>
inoremap <C-x> <C-v><C-x>
I forget what the other firefox shortcuts like
Ctrl-A do but hopefully here's enough to demonstrate how you might achieve what you want.