Scammers operating tech support scam websites have come up with a new way to the get visitors blocked from browsing the web. This happens when a person visits the shady sites set up by said scammers, and is intended to scare non-technical users into asking for assistance. Help invariably shows up in the form of unneeded software or servicing fees from the scammers.
This may still be a problem if the browser is configured to open the last open pages after restarting, in which case it is best to close the tabs on the malicious site first thing. That way, the page cannot load and begin any downloads on your computer, so you know you are mostly safe.
The download bomb trick comes on the heels of the history.pushState API, which similarly froze Chrome on malicious websites. Google had comes up with a fix for the latter, after which the download bomb began attacking users. The trick, as such, only works in Chrome, and if the user lands on the same sites while using other browsers, they will be redirected to other pages. So the next time Google Chrome keeps freezing on a new site, you know what the reason may be.
As long as we are on the topic of shady sites, you should also stay clear of sites that push fake Adobe Flash update packages. These can contain CPU miners, which can cause your system to slow down. Also dangerous are dubious sites pretending to sell you browser updates.