Vimium setup I use

css.css

/*links badges styles*/
div > .vimiumHintMarker {
background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#d31d60), to(#d31d60));
border: 1px solid #a30830;
text-shadow: none !important;
box-shadow: none;
border-radius: 3px;
}

div > .vimiumHintMarker span {
color: #fdfdfd;
font-weight: bold;
font-size: 12px;
font-family: 'monospace';
}

div > .vimiumHintMarker > .matchingCharacter {
color: #fdfdfd;
}

/*'help' dialog styles*/
div#vimiumHelpDialogContainer{
  background-color: #1c1c1c;
  border-color: #5a5a5a;
}

div#vimiumHelpDialogContainer .vimiumReset,
div#vimiumHelpDialogContainer div.vimiumReset,
div#vimiumHelpDialogContainer span.vimiumReset,
div#vimiumHelpDialogContainer table.vimiumReset,
div#vimiumHelpDialogContainer td.vimiumReset,
div#vimiumHelpDialogContainer tr.vimiumReset {
  color: #aaa;
}
div#vimiumHelpDialogContainer a.vimiumReset,
div#vimiumHelpDialogContainer a:visited.vimiumReset,
div#vimiumHelpDialogContainer a:link.vimiumReset,
div#vimiumHelpDialogContainer a:hover.vimiumReset {
  color: #4f80ce;
}

span.vimiumHelpDialogKey {
  background-color: #d31d60;
  color: #fdfdfd;
  border-color: #a30830;
  border-bottom-color: #a30830;
  box-shadow: inset 0 -1px 0 #a30830;
}

/*down right badge showing current mode*/
div.vimiumHUD {
  background-color: #1c1c1c;
  border-color: #a30830;
  border-width: 2px;
  border-bottom: none;
  color: #d31d60;
  text-shadow: none;
  font-weight: bold;
  font-size: 13px;
}
div.vimiumHUD span#hud-find-input {
  color: #fdfdfd;
  font-family: "monospace";
}
div.vimiumHUD span#hud-match-count {
  margin-left: 10px;
}

/* vomnibar styles */
#vomnibar,
#vomnibar div.vomnibarSearchArea {
  background-color: #2c2c2c;
  border-color: #730810;
  border-width: 1px;
  /*border-color: #5a5a5a;*/
}
input#vomnibarInput,
#vomnibar li,
#vomnibar ul{
  /*color: #d31d60;*/
  color: #aaa;
  font-weight: bold;
  background-color: #1c1c1c;
  /*border-color: #a30830;*/
  border-color: #5a5a5a;
}
#vomnibar li .vomnibarSource {color: #555;}
#vomnibar li .vomnibarTitle {color: #777;}
#vomnibar li .vomnibarTitle .vomnibarMatch{color: #d31d60;}
#vomnibar li .vomnibarUrl {color: #325694;}
#vomnibar li .vomnibarMatch{color: #724684;}

#vomnibar li.vomnibarSelected{ background-color: #2c1c1d;}
#vomnibar .vomnibarSelected::before {
    content: '>';
    line-height: 30px;
    font-size: 25px;
    font-family: monospace;
    position: absolute;
    left: 7px;
    top: 0px;
    color: #d31d60;
}

/*dark overlay*/
iframe.vomnibarFrame {
  width: 100vw;
  height: 100vh;
  top: 0;
  left: 0;
  margin: 0;
  background-color: rgba(30, 27, 29, .88);
}
iframe.vomnibarFrame[class="block"] {

}
#vomnibar {
  position: static;
  width: 80%;
  margin: 20px 0 0 10%;
  box-shadow: 0px 2px 10px rgba(240, 19, 48, 0.4);
}

key-mappings.vim

# Insert your preferred key mappings here.
unmap H
unmap J
unmap K
unmap L

map H previousTab
map J goBack
map K goForward
map L nextTab

search

w: https://www.wikipedia.org/w/index.php?title=Special:Search&search=%s Wikipedia
t: https://translate.google.ru/?source=osdd#auto/ru/%s Translate
mdn: https://developer.mozilla.org/en-US/search?q=%s&w=3&qs=plugin MDN
y: https://www.youtube.com/results?search_query=%s Youtube
npm: https://www.npmjs.com/search?q=%s npmjs.com