ProCon is described as 'Content filter for the Firefox browser that can filters any type of content on any web page. If left on default, ProCon limits itself to filter pages containing explicit content automatically, based on the text' and is a parental control tool in the home & family category. There are more than 25 alternatives to ProCon for a variety of platforms, including Windows, Mac, Android, iPhone and iPad apps. The best ProCon alternative is Plucky. It's not free, so if you're looking for a free alternative, you could try Plucky or Screen Time. Other great apps like ProCon are Covenant Eyes, Norton Family, HomeGuard Activity Monitor and FamilyShield.