Moving from Arc to camber

Last updated 11 Nov 2026, for camber 0.4.0

The Browser Company is shutting Arc down. From 22 December 2026 it won't open on macOS or Windows, and Arc accounts are deactivated the same day (TidBITS). Your spaces, pinned tabs, favorites and folders live in one file on your computer, and that file is what camber imports. This page is how to keep it, what camber does with it, and when another browser is the better pick. For everything else to get out of Arc before then (passwords, extensions, exports), see what to do before Arc shuts down.

First, copy your sidebar file

Do this before 22 December. Arc keeps its sidebar in StorableSidebar.json:

• macOS: ~/Library/Application Support/Arc/StorableSidebar.json. In Finder, Go, Go to Folder, paste the folder part.
• Windows: %LOCALAPPDATA%\Packages\TheBrowserCompany.Arc_…\LocalCache\Local\Arc\StorableSidebar.json (the folder name after Arc_ varies).

Copy it somewhere outside Arc's folder. I don't know whether the file survives once Arc stops opening, and a copy costs nothing. camber can import from a copy at any time, on any computer. The file lists your tabs and their addresses, so treat it like your browsing history and don't post it anywhere.

Arc also has Settings, Advanced, Export Data, which exports pinned tabs and favorites in its own format. camber reads the sidebar file, not that export. If you're moving to Dia or Zen instead, run their import while Arc still works; the copy above is for camber.

Import into camber

1. Install camber from the download section. On a Mac, brew install yuvrajangadsingh/tap/camber also works.
2. With Arc still installed on macOS or Windows, camber finds the file itself. The first time, the sidebar offers an Import from Arc button; after that, use File, Import from Arc.
3. On Linux, on another computer, or after Arc is gone: File, Import Arc File, and pick your copy.
4. On Windows and Linux there's no menu bar: the File menu opens from the ≡ button at the top left of the sidebar (camber 0.3.2 and later).

What comes over: spaces with their names and colors, Arc's profiles (spaces that shared logins in Arc share them in camber), favorites, pinned tabs with the names you gave them, folders as deep as you nested them, and today tabs. Importing again replaces the spaces it brought in before instead of adding copies, and that includes anything you changed in those spaces inside camber. So import again only before you start rearranging them in camber.

What doesn't: history, passwords, bookmarks, extensions, Boosts and Easels. Split views and tab groups become plain tabs. Logins don't carry over, so you sign in to each site again.

The Windows path comes from how Arc installs there; I haven't tried it on a real Windows Arc install yet. If Import from Arc finds nothing on Windows, use Import Arc File with the file from the path above, and please tell me.

After the import

• Extensions: install them again from the Chrome Web Store (File, Chrome Web Store). Their buttons show up in the sidebar.
• Passwords: camber 0.4.0 and later asks to save a password when you sign in and fills it in next time (File, Passwords lists them). There is no import, so your Arc passwords don't come over: you sign in once per site and save as you go. It only works on https sites and misses some sign-in forms (the README says which). I have tried it on macOS only; on Linux it needs GNOME Keyring or KWallet. Bitwarden's extension installs and opens, but autofill with a logged-in vault hasn't been tested. 1Password doesn't work in camber yet.
• Streaming: Netflix, Prime Video, Disney+ and Spotify on the web don't play, because camber has no Widevine.
• camber isn't notarized on macOS or signed on Windows yet, so both warn the first time you open it (Homebrew on a Mac skips the warning). The camber page says how to get past that.

When Dia or Zen fits better

Dia is The Browser Company's own browser and where Arc points its users. Its importer brings over spaces, folders and tab groups, plus passwords, bookmarks, extensions and history (9to5Mac). If you want your passwords and history to come along too and don't need open source, start there.

Zen is open source and built on Firefox. Since 1.24b it imports spaces and profiles from Arc and Dia (release notes). It's further along than camber and runs Firefox add-ons rather than Chrome extensions.

camber is for people who want Arc's sidebar on Chromium, open source (GPL-3.0), with no AI and no account, on macOS (Apple Silicon and Intel), Windows and Linux. It's a beta built by one person, so expect bugs. The full list of gaps is in the README.

Something didn't come over?

Use Feedback at the bottom of camber's sidebar, or open a GitHub issue. Say which Arc version and OS the file came from, and what was missing. Please don't attach the file itself.