Linking the extension to your account
Sign in inside the extension so it syncs with the website.
Open the extension and choose Sign in, then use the same email and password as your website account. Once signed in, the extension is linked to your account and the website recognizes it as connected.
Linking is what enables two-way syncing, earning XP, and pushing your data for bounties. To disconnect, use Sign out in the extension; your local library stays on your device and simply stops syncing until you sign back in.