Get the extension

Chrome · Edge · Brave · Arc

Download bigbrain-chrome-0.9.4.zip

1. Unzip it. Chrome installs a folder, not the zip.
2. Open chrome://extensions and switch on Developer mode (top right).
3. Load unpacked → choose the unzipped folder.

To update, unzip the new build over the old folder and press ↻ on the extension's card. The genuine build shows the id ddnflabpbjfcakilfjmbinhblgbmckpb on that card.

Firefox · Zen · Developer Edition

Download send_to_bigbrain-0.9.4-unsigned.xpi

Release Firefox requires every add-on to be signed by Mozilla, and enforces that even with signature checks off — a signed build is coming. Until then, either:

1. Any Firefox: about:debugging → This Firefox → Load Temporary Add-on → pick the file. Works everywhere; gone when the browser restarts.
2. Zen, Developer Edition, Nightly: open about:addons → the gear menu (top right) → Install Add-on From File… → pick the file. It stays installed. If the browser calls it corrupt or unverified, that build ships with signature checks on — open about:config, set xpinstall.signatures.required to false, and install it again.

That same “corrupt” message on release Firefox is about the missing signature, not a damaged download.

Then pair it

1. In BigBrain: settings → integrations → PAIR A BROWSER. A code appears — ten minutes, one use.
2. In the extension's options (right-click its toolbar button → Options): leave the address at http://127.0.0.1:4748, enter the code, Connect.

The extension sends each clipped page to the BigBrain running on this machine, at 127.0.0.1, and to nothing else. Pair each browser once; BigBrain's integrations card lists every browser that has, and REVOKE there is disconnect.