Google Inbox is insanely slow on Firefox

I use Firefox browser on all platforms. I use Google Inbox in mobile(Android) and GMail on desktop. With the recent launch of Inbox for Firefox, I gave it a run.

Inbox was insanely slow on Firefox. I takes around 80MB of memory(took the stat from about:memory). The rendering is very slow. The animations are not smooth while switching from one view to another.

I have two questions here,

1. Is there anyone who is facing similar behavior? 2. How do I take more metrics (or what are metric I should compare), to check the performance across different browsers from the client side