Every new version that come out, it's getting worse than ever. I've updated to version 57 but then had to revert back to 56.0.2. Version 57 is the worst version ever! Why? It no longer support the legacy tab group extension, which made Firefox one of the most favorite browser until now. In fact, the tab group feature in Firefox is the only feature that does not exist in other browsers. Sure they would say that they have it, but do you even look at their definition of "TAB GROUP" ?? Tab groups in Chrome and other browsers are basically opening new windows with a set of tabs. It cause multiple windows to show on the Windows task bar and made every thing messy. Moreover, the settings and groupings of those tabs can not be saved at all. In fact, they even made "TAB GROUP" the same as "BOOKMARK GROUP". How silly is that?? In Firefox, tab groups are not implemented in the same way. A tab group does not make multiple windows in the Windows task bar, and every tab is only visible if the tab group is visible. You can even organize the structure of every group and position of every tabs within a tab group. The UI for managing tab groups is already PERFECT! This is the MAIN SELLING POINT of Firefox until now! So why do you ruin it and become copy cat of Chrome?? Why does Mozilla has to implement the same thing that existed in Google Chrome, but with different UI?? If millions of Firefox users wanted the features in Chrome, then they would have used Google Chrome instead! But do they ?? Of course not! They are still using Firefox because of the features not available in other browsers! And you eliminate the only differentiating features?? Use your brain Mozilla and be different than others!