Can not input a search query in about:config in Firefox 55.0.3

[Joe Petree]

I am at Firefox 55.0.3, 32-bit.

My Vimperator version is 3.16.0

When I go to  "ABOUT:CONFIG" , I am not able to input data into the SEARCH  box. 

I disable all Vimperator keys-- by using  SHIFT+ESC.  That does not change the problem. 

I disable the Vimperator add-on, and restart Firefox.  That fixes the problem. 

It appears Vimperator is broken.

My vimperator_rc file is rather straightforward and is shown below.

Thank you.

Joe Petree

"3.8.2 (created: 2014/02/13 23:52:43)
set "titlestring= Mozilla Firefox - Vimperator"
source! "C:\\Users\\Joey\\_vimperatorrc.local"
"set errorbells
"   highlight hint color: purple, backgroundcolor: yellow
":highlight Hint font-size:200%;color:white;background-color:red;padding:2px;
"highlight Hint font-size:11;font-style:bold;color:yellow;background-color:purple;padding:2px;
"highlight Hint font-weight:bold;font:Georgia;font-size:11;color:lightgreen;background-color:purple;padding:2px;
:highlight Hint font-weight:bold;font:Georgia;font-size:11;color:#cdfe3a;background-color:purple;padding:2px;
"highlight HintElem  background-color:#d8f4b5; color: black;          " comment - pale mint green
"highlight HintElem  background-color:#f0e9fc; color: black;          " comment - pale lavender
:highlight HintElem  background-color:#ffe6bb; color: black;          " comment - pale peach
" go down the default scroll amount:
:map l <C-d>
" go up the default scroll amount:
:map h <C-u>
" Disable the q (record) command:
:map q
" Switch the J and K keys - J is single line up, K is single line down
:noremap j k
:noremap k j
" Ctrl-a                     Make Ctrl+A select all.  Vimperator changes Ctrl+A!!! Yuck!
"     Note:  in the following, the "I" of "inoremap" is "Insert" mode.
inoremap <C-a> <C-v><C-a>
" Switch the map keys - F = new tab.  Shift+F = same tab
:noremap f F
:noremap F f
" Info to show on status bar.   Most options are rather useless
":set  status=position
" The following  unchecks "Open new windows in a new tab instead"
":set popups=window
":set! browser.link.open_newwindow=1             " this does not work
":set! browser.cache.disk.capacity=359400        " this does not work