I wouldn't defrag the laptop anyway. That used to be the go-to advice in the days of Win95 and earlier. But as Windows became more complex, and DOS ceased to be the backbone of Windows, hard drives became smaller in physical size and larger in data space, defragging not only became unnecessary most of the time, but it could actually cause problems that hadn't previously existed.
I'm guessing it was the ccleaner that solved the problem, cleaning out all the junk your browser has stored over time and never let go of. You should occasionally clean out your browser - delete history, clear cookies, delete temporary internet files. Every couple of weeks is usually sufficient.
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