9to5Linux Weekly Roundup for December 14th, 2025, brings news about Firefox 146, Cinnamon 6.6. pearOS, KDE Gear 25.12, KDE Plasma 6.5.4, KDE Frameworks 6.21, COSMIC on Pop!_OS 24.04 LTS, Thunderbird 146, Tails 7.3.1, AerynOS 2025.12, Parrot 7.0 Beta, Raspberry Pi Imager 2.0.2, NVIDIA 580.119.02, Kali Linux 2025.4, Grml 2025.12, Linux 6.19 RC, Mixxx 2.5.4, and more.