Firefox 147 introduces XDG Base Directory Specification support on Linux, ending a 20-year-old bug by organizing config, data, and cache files into standard locations (only for new installs). The release includes sharper rendering on GNOME with fractional scaling, automatic Picture-in-Picture mode for videos when switching tabs, improved AMD GPU video playback performance, and adoption of Safe Browsing V5 protocol. Web developers gain support for CSS Module Scripts, Navigation API, CSS anchor positioning, and ES modules in service workers. Experimental features include customizable keyboard shortcuts and improved split tabs functionality.
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