This brand new Lava x50 4G marshmallow 6.0 phone India. Just installed AVG antivirus and few small apps only from play store. While installing few ad blocker add-ons in Firefox 5.6 0 browser to stop ad flows, had a popup that start installing a quick patch named RozBuzz in a separate download window and could not stop or pause it. Now prob start here as everytime open ffox, opens a additional junk tab. Added, occupied around 1 GB space in internal memory. There is only 2gb files but show 3.15gb occupied memory. Tried clearing ffox cache and fresh ffox install, not solved. No malicious app in a