Palemoon has the Tab Groups feature as a separate addon: http://www.palemoon.org/tabgroups.shtml http://www.palemoon.org/tabgroups.shtml Source code is here: h

Palemoon has the Tab Groups feature as a separate addon: http://www.palemoon.org/tabgroups.shtml http://www.palemoon.org/tabgroups.shtml Source code is here: https://github.com/wolfbeast/palemoon-tabgroups https://github.com/wolfbeast/palemoon-tabgroups "This is the repository for the Tabgroups add-on source code for Pale Moon, based on Tim Taubert's work as part of the proposal to remove Tab groups from Firefox and moving the removed code to an extension." Installs fine in Firefox 45a too, but it's not signed (obviously).