How to temporary block list of web pages?

Hi While working I need access to web pages (I am developing web applications) but same time often I got distracted and spend my time reading interesting articles on web instead doing my job. I was using LeechBlock addon for Firefox, but now I migrated to chrome. So my question is:
Is there simple way how to temporary block list of web pages for all browsers?
It is OK to block http/https access only, but no problem to block all traffic from/to this sites. I need to by able to easily start/stop this block.

No. Each domain has (or has not) its own IP address. The IP address of a parent domain has no influence on the IP address of subdomains.
If you want to be able to use willcard, the best way is probably to base the filtering on HTTP level traffic.
That is directly in the client (firefox/chrome extensions)
Or, using an http proxy (squid).
Or, may be, using iptables with rules that match the URL.
eg
sudo iptables -A OUTPUT -p tcp --dport 80 -m string --string "google.com" --algo kmp -j DROP
will block outgoing traffic matching "google.com". You can of course tune better rules.
sudo iptables -F OUTPUT will flush all rules.
You can then add many "iptables -A OUTPUT" lines in a script, and associate a key shortcut to this script...
Well, an extension to the browser is probably preferable. I give this solution only for the fun

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