Arcsidebar 0.4.6

Run the setup script again for the layout ones: they live in the profile, not
in the add-on.

• Lucide icons throughout. The sound indicator is a speaker glyph in a chip
  next to the favicon, where Arc puts it, instead of an emoji at the end of
  the row.

• The line above the tab list runs the full width when "New Tab · Clear" is
  hidden, instead of stopping short at invisible labels.

• The sidebar can be dragged to any width, for real this time. Three things
  were breaking it: an older copy of the stylesheet left in the profile by a
  manual install, a display override that replaced the splitter's own frame,
  and the marker Arc writes into the window title — a window that had ever
  been hidden with Option+Shift+S lost its resize handle without looking
  hidden. Option+Shift+S was broken by the same mismatch and works again.

• Firefox keeps the width the sidebar is dragged to. It was pinned in
  user.js, which is applied at every start, so it reset on every launch.

• The setup leaves symlinked files alone and says so when it finds an Arc
  stylesheet outside the block it manages.

• Thinner scrollbars in the tab and pinned lists (this one is in the add-on).

Install: download arc-0.4.6.xpi below and open it in Firefox. Installed copies update themselves.