Web Search Pro is an awesome tool I wish I had discovered earlier. It's a FireFox addon that adds quite a few features around your FireFox search box . 1. Group search engines (for Multi-Search) This is my favorite feature! The tool allows to group your installed search engines by topic or the purpose (for example, social media search, reference search, etc) and then search multiple search engines at a time (all result pages will open in separate tabs). 2.