Android built has this great feature which allows users to complete an action using all the available apps with similar functionality, i.e. type something on home screen search bar and tap go, it will display all the apps that can perform that action. In this case, browsers.
The quick fix to this minor issue which was caused because of a minor ignorance, is simple. Navigate to device Settings. Scroll down to Apps. Find the app, tap to get further into app information. Scroll down and tap Clear Defaults under Launch By Default. Yes, its that simple. On the contrary, if you tap ‘use by default for this action’ on the ‘Complete action using’ pop up window. It does mention ‘Clear default in Home Settings > Applications > Manage Applications’.