Yes, there are dozens of different mining sites that use your computers' processors and can be accessed through browsers. These sites start processing information to generate crypto money with the support of your processing power and send crypto money to your digital wallet at the rate you provide. However, if your processors are not fast, all systems produced for personal use are inadequate and in vain, you will tire your processor.
Similar systems are widespread for smartphones, and they contain countless fraudulent tricks. For example, there is an iOS supported mining application called MobileMiner which is installed on iPhone X. To use it, you need to be an iOS developer and not use the device during mining. It becomes impossible to use it due to the excessive load on the processor. In addition, applications that demand such high processing power running in the background bring your phone to high temperatures. I have to mention that the current mining systems have water-cooled engines and even the simplest hardware quadruples your electricity bill.