Make sure of your Access point settings

What mobile service provider? We have had problems with mobile service providers blocking Firefox for Android because they are trying to stop people tethering to desktop devices.

Yes, in fact, it works well with my Android stock browser

Are you getting any error when accessing via APN

My mobile provider is Petro-Canada Mobility in Ontario, Canada

http://mobility.petro-canada.ca/default.aspx

Hi @IAmJayaKumars, no errors, FF just keep looking for internet connectivity.

This is a bug that is fixed with Aurora (Firefox 19)

See https://bugzilla.mozilla.org/show_bug.cgi?id=749352

Aurora will become Firefox Beta very soon.