
Electrolysis mimics a technology that made Google's Chrome browser pretty much an overnight success. It allows the browser tabs or processes to perform separately. One of the advantages of this technology is that when a website crashes your browser or slows it down you can regain control by killing that individual process.
Mozilla already brought the technology to Firefox platform last year but it was a half baked version. Now it should work on the browser as intended and is fully functional. You should expect more responsive UI and smoother performance.
You can download Firefox 54 here