Hello, here from Copay 's developer.
The link affects for an old version of Copay. Right now, the published version is v0.10.5 and it doesn't have these problem.
Regarding to use an online wallet (like blockchain) is really insecure, because any trojan or virus (or any website with malicious code) could read your data from localStorage (blockchain and old copay 's web version used to use localStorage). So, the new version is working on iOS, Android, WP and ChromeApp, that store encrypted information and these are only readable from the application itself.
My recommendation is not use an online (web) wallet to manage your funds.