Been running this continuously since it hit koji with a fairly heavy usage profile (100+ tabs, 15 addons, youtube HTML5, multiple video tags, etc.) and haven't encountered any problems.
Developed some python code and did some git operations; works great for me.
This update has been unpushed
Deployed across 150+ machines and it appears to both work fine and fix my issue (1063827).
This update has been submitted for stable
This fixes 1203913 for me and appears to work fine otherwise.