Hellosearch.fr is a browser hijacker that promotes a dubious search engine. Hellosearch.fr will suddenly appear on your browser and make unwanted changes. It is not malicious as damaging your computer is not its intention. What it will try to do is redirect you to sponsored pages so that it can generate pay-per-click income. In general, Hellosearch.fr does not perform like a very reliable search engine, it might lack essential results and instead insert advertisements. When dealing with browser hijackers you need to be careful with the redirects it performs.