bitwarden-estensione-browser/src/popup/app/components/icon.component.html

<div class="icon">
    <img ng-src="{{$ctrl.image}}" fallback-src="{{$ctrl.fallbackImage}}" ng-if="$ctrl.imageEnabled && $ctrl.image" alt="" />
    <i class="fa fa-fw fa-lg {{$ctrl.icon}}" ng-if="!$ctrl.imageEnabled || !$ctrl.image"></i>
</div>