Comment 3 for bug 1355484

This could help with the rounded corners, add in aps.css:

border-radius: 0;

so it looks like this:

.search-item:hover,
.search-item:focus {
    background-color:@selected_bg_color;
    color:@selected_fg_color;
    text-shadow: 0 1px 1px alpha (#000, 0.25);
    icon-shadow: 0 1px 1px alpha (#000, 0.25);
    border-radius: 0;
}