Whataspp not working - Suggest agent ID change.

Hello. Whatsapp seesm to be asking to upgrade to chrome, opera, etc. Any of the branded browsers. However, it fails to detect Firework as chromium (and by extension Chrome). Is there a chance to force Firework to change the user agent to Chrome, so that apps can be more compatible? Since you already have the mobile phone agent switch, I am thinking this one is probably a small tweak.

Anyway, thanks in advance.