Firefox 57 Brings Better Sandboxing on Linux (bleepingcomputer.com)
Catalin Cimpanu, writing for BleepingComputer: Firefox 57, set to be released tomorrow, will ship with improvements to the browser's sandbox security feature for Linux users. The Firefox sandboxing feature isolates the browser from the operating system in a way to prevent web attacks from using a vulnerability in the browser engine and its legitimate functions to attack the underlying operating system, place malware on the filesystem, or steal local files. Chrome has always run inside a sandbox. Initially, Firefox ran only a few plugins inside a sandbox -- such as Flash, DRM, and other multimedia encoding plugins.
I dread updating to Firefox 57, because it will break all of my plugins.
Remember that Firefox 57 also only supports WebExtensions add-ons, which will break lots of add-ons including some used for security. How about giving users a choice whether they want faster speeds or to retain the functionality of XUL add-ons. This is what Apple calls courage. I call it asinine. Let users upgrade and get the additional security, but let them decide if they want speed or legacy add-ons.