Laptops Lenovo G50- 45: No smooth browsing

Laptop link: http://www.flipkart.com/lenovo-g50-...1&srno=p_11&query=G50+45&otracker=from-search

1) Browser: Firefox (updated)
2) Problem: Lag while browsing (Add ons installed: Adblock, IDM, Youtube Downloader)
3) Already tried: Reinstalling firefox, windows
4) Using ccleaner to clean junk files and other errors.
6) Irrelevant startup items disabled
7) Current RAM: 12GB (4GB + 8GB)
8GB RAM link: http://www.amazon.in/gp/product/B00CQ35HBQ?psc=1&redirect=true&ref_=oh_aui_detailpage_o09_s00


Please advice
 
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