Download and install electrum. Don't find that feature on any web wallet. Installing electrum will take just a minute.
I have some bitcoins on blockchain.info, will they be secured? Or I have to shift them to any other wallet?
and is there any other simple web wallet? as I do not unserstand that how it work, it need to download the extention. I need a fully web wallet
As for reference thread given to you above, yes it's a must that you need to transfer all your coins outside of web wallet. What will be my recommendation? The wallet I mentioned above, Electrum.