There are already plenty of bug reports with several comments see bug 1722368
all the feedback comments here:
You will find most people are particulary verbal about the bookmarks because it probably has the most menu list items and therefore irrates the most. But generic uniformity should be maintained for all menu items.
Basically, all drop down menus that were effected by the unnecessary increase in space between menu items.
Any drop down menu from the Menu Bar eg: bookmarks
Drop down menu in the menu app hamburger.
Right click drop down menus etc.
People who have the ability are currently being forced to create and use userChrome.css to work around the usability issues.
People are just irritated by the inconvenience of extra scrolling which is slowing down work throughput and with repeated use, the current design helps to increase RSI issues.
So many thanks for realising this is a serious issue and helping to fix it quickly.