LeechBlock is not compatible with Firefox 57+. For an explanation and information on a new version compatible with WebExtensions, go to: http://www.proginosko.com/leechblock/faq/compatible-with-firefox-57/ LeechBlock is a simple free productivity tool designed to block those time-wasting sites that can suck the life out of your working day. (You know: the ones that rhyme with "Blue Cube", "Space H
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