Vifm does not display hidden files and directories by default. The keys to control the showing and hiding of hidden files are borrowed from the code folding keys in Vim.
za: Toggle showing hidden files zo: Show hidden files zm: Hide hidden files
Remember that Vifm remembers your settings between invocations, so if you set it to show, it will remember this when you open it next time.
Tried with: Vifm 0.7.7 and Ubuntu 14.04