Pentadactyl provides several ways to edit text areas or input fields. After switching focus to a text field, Insert mode or Text Edit mode is activated, depending on your 'insertmode' settings. You can also use an external editor.
In Insert mode, all keys except for those described in the index are passed directly to Firefox.
Text Edit mode provides basic Vim-like text editing. It can be entered from Insert mode by pressing I_<C-t> or started directly when a text area is focused if 'insertmode' is unset. See the index for a list of currently supported mappings.