Arcsidebar 0.6.0

• Arc no longer has its own hide/show shortcut. Hiding is Firefox's sidebar
  toggle now — the toolbar button, View → Sidebar, or its shortcut — and the
  extensions row hides with it. Arc's own hide mode was stored per window and
  survived restarts, so a window could come back hidden with no visible way
  out; that state is gone.

• The setup turns on Firefox's Picture-in-Picture on tab switch, so a playing
  video pops out when you leave its tab and returns when you come back, the way
  Arc does. Firefox has this built in; some profiles ship with it off.

• Dragging a tab above the list drops it at the top. The strip with the divider
  and "New Tab · Clear" accepted nothing, so the line stayed on screen while the
  drop was refused.

Install: download arc-0.6.0.xpi below and open it in Firefox. Installed copies update themselves.

Arcsidebar 0.5.1

• Tabs nobody has looked at for 45 minutes are unloaded, and load again when
  clicked. A space's tabs stay in memory while the space is hidden, so a window
  was holding every tab of every space at once. Tabs playing audio, tabs in
  private windows and the tab you're on are left alone.

Install: download arc-0.5.1.xpi below and open it in Firefox. Installed copies update themselves.

Arcsidebar 0.5.0

• Badge icons other extensions set (like Tab Driver's robot) sit between the
  favicon or sound icon and the title, and look like the sound button instead
  of taking the space's color. A pulsing icon shows a small blinking green dot
  instead of blinking itself. (0.4.9 was meant to carry this and shipped an
  older build by mistake.)

Install: download arc-0.5.0.xpi below and open it in Firefox. Installed copies update themselves.

Arcsidebar 0.4.9

• Badge icons other extensions set (like Tab Driver's robot) sit between the
  favicon or sound icon and the title, and look like the sound button instead
  of taking the space's color. A pulsing icon shows a small blinking green dot
  instead of blinking itself.

Install: download arc-0.4.9.xpi below and open it in Firefox. Installed copies update themselves.

Arcsidebar 0.4.8

• Other extensions can add items to the sidebar's tab menu, the same way they
  set badges: up to five, optionally limited to certain tabs, with clicks sent
  back to the extension that added them.

Install: download arc-0.4.8.xpi below and open it in Firefox. Installed copies update themselves.

Arcsidebar 0.4.7

• Favorites stay four across at the usual sidebar width, and gain a column
  roughly every 64px as the sidebar is dragged wider, instead of the tiles
  growing with it.
• Tab badges other extensions set can be an icon (bot, sparkles), sit at the
  start of the row, or pulse.

Install: download arc-0.4.7.xpi below and open it in Firefox. Installed copies update themselves.

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.

Arc 0.4.0

Arc now owns Cmd/Ctrl+T and Cmd/Ctrl+W: the command bar opens with no flash from Firefox's own new tab, and a space keeps its last command bar instead of emptying. Run the setup script again (it clears the two reserved keys in customKeys.json) and restart Firefox.

Install: download arc-0.4.0.xpi below and open it in Firefox. Installed copies update themselves.

Arc 0.3.29

Install: download arc-0.3.29.xpi below and open it in Firefox. Installed copies update themselves.

Arc 0.3.28

Install: download arc-0.3.28.xpi below and open it in Firefox. Installed copies update themselves.