#Firefox: I finally found a good Tab Groups / Panorama replacement that works with the modern extensions:
"Simple Tab Groups" by Drive4ik [addons.mozilla.org]
Now I can task-swap and actually find the tabs I left off with again! Yay!
#Firefox 61: Accessibility Inspector. "Accessibility features are deactivated by default because they negatively impact performance. Consider turning off accessibility features before using other Developer Tools panels."