Update: In case it is of use to other users of Vimium, I’ve found a workaround for removing persistent previews. Add this to the ‘custom key mappings’ field under ‘Vimium options’:
map x LinkHints.activateMode action=hover
where ‘x’ is the key binding for this action (I use ‘q’). Just press that key and select the link corresponding to the preview you want to disable. (The behavior is a bit erratic; sometimes you need to do it twice.)
Update: In case it is of use to other users of Vimium, I’ve found a workaround for removing persistent previews. Add this to the ‘custom key mappings’ field under ‘Vimium options’:
where ‘x’ is the key binding for this action (I use ‘q’). Just press that key and select the link corresponding to the preview you want to disable. (The behavior is a bit erratic; sometimes you need to do it twice.)