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So far, I've been using various web site blockers, but I haven't found any that can synchronize a list of blocked sites. Is there any way to synchronize a list of blocked websites between multiple computers (so that the websites cannot be accessed from any of the computers?)

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You can get sync to work for any extension, by using dropbox or something like that and sync the folder where the extension store settings. – Ankit Mishra Dec 7 '12 at 6:31
@Lamb Is it possible to use Dropbox to synchronize files that are outside the Dropbox folder? – Anderson Green Dec 7 '12 at 16:05
Not officially, but it is possible with use of, Sync Toy provided by Microsoft, or by using symlinks, a lifehacker article. – Ankit Mishra Dec 10 '12 at 5:38

If your list of websites is just a list of domain names — you can set up your own DNS server somewhere and use that DNS for all your machines. For a server create a hosts file based on this list. It should look like

DNS server software options depend on your OS. for linux you can try dnsmasq. You can even run it on your OpenWRT-compatible router.

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So far, the only browser extension that can do this (that I know of) is called StayFocusd (for Google Chrome). There may be other extensions with this feature as well, but I haven't found any others yet (after much searching).

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I hope there are browser extensions for Firefox that can do this as well - I sometimes use Firefox as well as Chrome. – Anderson Green Dec 7 '12 at 5:45

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