垂直タブ愛好家なのだがFirefox Nightlyにも入ったの気になる :eyes:

Firefox Sidebar and Vertical tabs: try them out in Nightly Firefox Labs 131 – Firefox Nightly News blog.nightly.mozilla.org/2024/08/07/firefox-sidebar-and-vertical-tabs-try-them-out-in-nightly-firefox-labs-131/