@leocg of course it would, this is just an additional measure if you leave your PC unattended for a while to be safe, or if you're sharing the same account with other people, if situations emerge where you have to provide someone short access to your pc and not having to creep over their shoulder to what they're gonna click and so on..
It could also be used as parental control to limit children accessing certain sites (it's much easier for an average user than configuring restricted access on your modem), a lot of use cases could be derived from this