Firefox should provide browser history statistics. I am not asking for a dedicated dashboard as such, but just displaying time consumed on each website and option to display in ascending/descending order based on time spent on these, should do the trick. The inclusion of this feature would help users to monitor and control their browsing habits. Like I wouldn't want to be on Reddit for 24hours in a week, and the information may give me necessary motivation to correct my behavior.
I understand there are addons for this, but I am hesitant in providing my browsing history or browsing behavior to a third party. Although, if it comes from Firefox, I would definitely use it. Thank you!