The scrollbar on firefox desktop only

1. is too wide
2. is not needed

That's because of

.plugin-content {
    color: #6b6b6b;
    background-color: #f8f8f8;
    overflow-y: scroll;
    -webkit-overflow-scrolling: touch;
    overflow-x: hidden;
    box-sizing: border-box;
    position: absolute;
    right: 0;
    bottom: 0;
    top: 0;
    left: 0
}

changing to overflow-y: auto; fixes the issue.

Can this be applied ?

/cc @marekd