Lightbeam for Firefox - Mozilla is the not-for-profit behind the lightning fast Firefox browser. We put people over profit to give everyone more power online.
Pocket Explore - A human curated version of the web
island - a free and opensource alternative to parellel space
Mailist - Receive weekly reminders of unread, bookmarked articles
Tree Style Tab - Tree Style Tab is an all-in-one Firefox extension that provides ability in order to operate tabs as a tree.
Always Reading - Queue up articles and schedule when you want to read them.