/* サイドバーを自動開閉するようにする （左側用）*/
:root {
--thin-tab-width: 2px;
--wide-tab-width: 350px;
}
#sidebar-box {
position: relative !important;
overflow-x: hidden !important;
min-width: var(--thin-tab-width) !important;
max-width: var(--thin-tab-width) !important;
box-shadow: 0 0 2px 0 rgba(0,0,0,.35);
z-index: 1 !important;
transition: all .1s ease;
}
#sidebar-box:hover {
min-width: var(--wide-tab-width) !important;
max-width: var(--wide-tab-width) !important;
box-shadow: 0 0 5px 0 rgba(0,0,0,.35);
margin-right: calc((var(--wide-tab-width) - var(--thin-tab-width)) * -1) !important;
}
#sidebar-box>#sidebar {
opacity: 0 !important;
}
#sidebar-box:hover>#sidebar {
opacity: 1 !important;
}
#sidebar-splitter {
}
/* Showing close button on tabs */
.tabbrowser-tab:not(:hover) .tab-close-button{ display:none; }
.tabbrowser-tab:not([pinned]):hover .tab-close-button{ display:block !important; }
}