I made a test to compare RAM consumption on FireFox. It seems Mac version needs more RAM than Linux with the same sessionstore.js. Here is the detail.
FireFox is fresh opening with the same sessionstore.js which contains 8 windows and 365 tabs and in low CPU utilization.
As you may see below, the Mac version consumes 1.13GB of RAM while Linux is 903.5MB.
- Apple: Mac mini (Late 2012) – Technical Specifications
- Apple: OS X
- GNOME: System Monitor
- Lenovo: Overview – ThinkPad T410, T410i
- Mozilla: FireFox
- Mozilla: Support: FireFox: Profiles – Where Firefox stores your bookmarks, passwords and other user data
- Wiki: Activity Monitor