Mozilla team has rolled out a new Test Pilot experiment that lets users customize some of their browser’s user interface element colors. The Color experiment lets users control background colors, highlights, and text colors as well. Mozilla has retired support for “full themes”” with the release of Firefox 57. The browser now supports only “”lightweight themes
Source: “” lets users view two web pages side by side inside the main Firefox window. The Side View feature takes advantage of a native Firefox feature called the sidebar panel.”