background.html

<script src="jquery.min.js"></script>
<script src="extensioner.js"></script>
<script>
  var groupExtCount = {};
  var groups = [];
  
  function reload() {
    chrome.management.getAll(function(extensionList) {
      groups = loadGroups();
      groupExtCount = enabledExtensionsForGroups(groups, extensionList);
      chrome.omnibox.setDefaultSuggestion({description:'Enter a group name'});
    });
  }

  chrome.omnibox.onInputStarted.addListener(function() {
    reload();
  });

  chrome.omnibox.onInputChanged.addListener(function(text, cb) {
    var result = [];
    for(var a = 0; a < groups.length; a++) {
      if(groups[a].name.toLowerCase().indexOf(text.toLowerCase()) >= 0) {
        var description = groups[a].name.replace(text, '<match>' + text + '</match>');
        var enable = groupExtCount[groups[a].name] == 0;
        description += ' <dim>' + (enable ? 'enable' : 'disable') + ' group</dim>';
        result.push({
          content: groups[a].name,
          description: description
        });
        if(groups[a].name == text) {
          chrome.omnibox.setDefaultSuggestion({description:(enable ? 'Enable' : 'Disable') + ' group %s'});
        } else {
          chrome.omnibox.setDefaultSuggestion({description:'Enter a group name'});
        }
      }
    }
    cb(result);
  });

  chrome.omnibox.onInputEntered.addListener(function(text) {
    for(var a = 0; a < groups.length; a++) {
      if(groups[a].name == text) {
        enableExtensions(groups[a].extensions, groupExtCount[groups[a].name] == 0);
        return;
      }
    }
    reload();
  });
</script>