I just upgraded to Ubuntu 12.10 from 12.04. But I cannot use WebApps. In fact there is no sign of them anywhere. Firefox and Chromium are not prompting for integration.

I tried re-installing both browsers/webapps plugin of each, but no luck. Out of curiousity, I tried to install unity-webapps-preview through terminal, apt-get reported that this operation is going to need 127mb. After installation, restarting session, nothing.

I re-ran the unity-webapp-preview in terminal and SURPRISINGLY it again asked me that this operation is going to need 58mb. After Installation, nothing.

Firefox is showing the unity-webapp plugin in Extensions but in Preferences there is noting like Unity settings or options for exceptions in General tab (as I seen in some threads).

Chromium is not even showing the plugin in Extensions nor in the settings. Really need help. I know there is a reported bug but it is mostly about the complains that the webapps are not working as they should but in my case they don't seem to exist.
EDIT: The out put of gsettings list-recursively | grep webapp is:

com.canonical.unity.webapps allowed-domains @as [] com.canonical.unity.webapps dontask-domains @as [] com.canonical.unity.webapps index-update-time 43200 com.canonical.unity.webapps integration-allowed true com.canonical.unity.webapps preauthorized-domains ['amazon.ca', 'amazon.cn', 'amazon.com', 'amazon.co.uk', 'amazon.de', 'amazon.es', 'amazon.fr', 'amazon.it', 'www.amazon.ca', 'www.amazon.cn', 'www.amazon.com', 'www.amazon.co.uk', 'www.amazon.de', 'www.amazon.es', 'www.amazon.fr', 'www.amazon.it', 'one.ubuntu.com']