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Copper 0.4.1 for Linux — built from 9c7cfdd4198f.
The Agent sidebar is here. Ctrl+E opens it on the right of the window, and your Copper Cloud decides what fills it: an addon, a small web app that updates without a new Copper. When the cloud hands out a new addon or version, Settings › Updates says Update available and Install loads it at once.
Install
curl -fsSL https://github.com/copper-browser/copper-linux/releases/latest/download/install.sh | shor download a file below: the .deb for Ubuntu 24.04+ / Debian 13+ (sudo apt install ./copper_amd64.deb),
or the .flatpak for any other distribution (flatpak install --user copper-x86_64.flatpak; the GNOME 51 runtime comes from Flathub).
x86_64 and aarch64. Each file has a .sha256 next to it, and SHA256SUMS lists them all.