Personal Blocklist(not by Google) is an alternative chrome extesions of Personal Blocklist(by Google).

the extension has some functions below.

• block bad websites from google search result.
• import button, adding multiple urls to blocklist.
• export button, sharing your blocklist to others.

Personal Blocklist(not by Google) is published in Chrome Web Store.

https://chrome.google.com/webstore/detail/personal-blocklistnot-by/cbbbhelcpfjhdcncigdlkabmjbgokmpg