There is a suggestion for this on the Firefox Developer Tools uservoice https://ffdevtools.uservoice.com/forums/246087-firefox-developer-tools-ideas/suggestion

There is a suggestion for this on the Firefox Developer Tools uservoice https://ffdevtools.uservoice.com/forums/246087-firefox-developer-tools-ideas/suggestions/6697309-separate-cookie-profiles-per-tab-tree-or-group https://ffdevtools.uservoice.com/forums/246087-firefox-devel...