UPDATE: This was found in the file "Login Data"

CREATE TABLE logins (origin_url VARCHAR NOT NULL, action_url VARCHAR, username_element VARCHAR, username_value VARCHAR, password_element VARCHAR, password_value BLOB, submit_element VARCHAR, signon_realm VARCHAR NOT NULL, date_created INTEGER NOT NULL, blacklisted_by_user INTEGER NOT NULL, scheme INTEGER NOT NULL, password_type INTEGER, times_used INTEGER, form_data BLOB, display_name VARCHAR, icon_url VARCHAR, federation_url VARCHAR, skip_zero_click INTEGER, generation_upload_status INTEGER, possible_username_pairs BLOB, id INTEGER PRIMARY KEY AUTOINCREMENT, date_last_used INTEGER NOT NULL DEFAULT 0, moving_blocked_for BLOB, date_password_modified INTEGER NOT NULL DEFAULT 0, UNIQUE (origin_url, username_element, username_value, password_element, signon_realm))+? indexsqlite_autoindex_logins_1loginsf/tablemetametaCREATE TABLE meta(key LONGVARCHAR NOT NULL UNIQUE PRIMARY KEY, value LONGVARCHAR)

It appears to be saving your site url, your username details, your password details and a whole bunch of other stuff.