Install the Flock extension

The extension fills marketplace sell forms from your Flock inventory — you review everything and press publish yourself. It isn't on the Chrome Web Store yet, so for now it installs manually. Takes about a minute.

Download flock-extension-latest.zip

Set it up in Chrome

1. Unzip the download. You'll get a folder with manifest.json inside. Keep the folder somewhere permanent — Chrome loads the extension from it, so deleting the folder removes the extension.
2. Open chrome://extensions — paste that into the address bar.
3. Turn on “Developer mode” — the toggle in the top-right corner.
4. Click “Load unpacked” and pick the unzipped folder (the one containing manifest.json).

Pair it with your account

1. Sign in at sellonflock.com, then go to Settings → Browser extension.
2. Click the Flock icon in Chrome's toolbar and paste the pairing code.

From then on, every listing in your inventory gets a one-click Fill button per marketplace. The extension opens the sell form in a tab, fills what it can, and stops — you press the marketplace's own submit button. There's an auto-submit toggle in the popup if you want it, off until you switch it on, and Mercari ignores it either way.

Updating

Manual installs don't auto-update. When something's fixed, download the zip again from this page, unzip it over the same folder, and click the reload arrow on the extension's card at chrome://extensions.

Chrome may warn about developer-mode extensions when it restarts — that's expected for any manually installed extension. What it does with your data is covered in the privacy page.