I like to organize my tabs into groups. Usually, I research an idea outside of a tab group (opening tabs to the far right of the tab bar) before right clicking the tabs I've opened and adding them to their appropriate tab group. This is to clean up my tab bar. When the tabs go the the group, though, it unfolds the tab group.
I just want to stash away those tabs and not use the group anymore. Thus, I have to click the tab group rectangle so that it refolds.
Please add an option in about:config or in the settings menu that toggles whether this unfolding behavior happens.
Go firefox!