New
#1
Between Australis, complete disregard for user customizability and demands, bloat, and general crappiness of Mozilla in general I am not the least bit surprised Firefox is quickly dying a well-deserved death. Especially with Australis, if I wanted to use a Chromium-like browser I'd just use Chromium instead.
The only reason I'm still "on" Firefox (scare quotes since I'm running Pale Moon, an unofficial Firefox deriative/fork) is because of NoScript, Tab Mix Plus, and Firefox's efficiency with regards to RAM use per open tab.
Ars Technica also gave a passing mention about this over here as well:
Windows 8.x, Internet Explorer both flatline in June | Ars Technica