I came across LibreWolf while browsing MacUpdate. It looks interesting but there are no reviews posted there. Does anyone have experience with it?

Depends on what you want. This treatise discusses a number of secure browsers including Librewolf. I also found this How To Geek article on why you should not use any Firefox forks. If you are really searching for a new browser this Source Forge chart compares four competitors and lists these alternatives to Librewolf.