通常利用しているWEBブラウザの「Firefox」をバージョン57.0.2にアップデートしました。
セキュリティ問題の対処版で、Windows半の実のバージョンアップだそうです。

～　リリースノート　～
Firefox — Notes (57.0.2) — Mozilla

Version 57.0.2, first offered to Release channel users on December 7, 2017

Brace yourself for an all-new Firefox. It’s fast. Really fast. It’s over twice as fast as Firefox from 6 months ago, built on a completely overhauled core engine with brand new technology from our advanced research group, and graced with a clean, modern interface. Today is the first of several releases we’re calling Firefox Quantum, all designed to get to the things you love and the stuff you need faster than ever before. Experience the difference on desktops running Windows, macOS, and Linux; on Android, speed improvements are landing as well, and both Android and iOS have a new look and feel. To learn more about Firefox Quantum, visit the Mozilla Blog.

Making Firefox look, feel and perform faster was no small feat. Employees and volunteers from around the world worked in record time to create the best Firefox yet. We’d like to extend a special thank you to all of the new Mozillians who contributed to this release of Firefox!

Fixed

Block old versions of G Data Endpoint Security for crashing Firefox on start up – Windows only (bug 1421991)

Fix a regression with WebGL and D3D9 – Windows only

　
　
速度が速いのはいいけど、やっぱりTab mix Plusが動いてくれないと不便だぁ・・・
しーゆー。