Block prompts when sites detect I'm using iOS On many forum web sites, if you go to the site on an iPhone/iPod/iPad it prompts to install an app for the site.  But 90% of the time when I visit a forum site, it's because I'm following a search result; I never ever want to install the app. Is there some setting in iOS that disables this kind of prompt?
These sites are using JavaScript to detect Mobile Safari's user agent and displaying an alert.

You can disable JavaScript in Safari's settings but it's probably not worth the lost functionality.