[German]Mozilla has released Firefox 58 for Android, Linux, macOS and Windows. This major release, dated on January 23, 2018, comes with fixes and improvements against version 57 (Qantum).
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The update to Firefox 58 has been offered here within my Firefox 57, after I opened the Firefox menu and selected Help – About Firefox.
The developers promise performance improvements coming with the new version in JavaScript and graphics rendering. Also Progressive Web App support has been added to Android. The Release Notes list all changes and new features.