Yes, I have had a currently open bug with FF21.0--that got worse with 22.0.
Where's the bug? Link to it.
And I and the other watchers of the bug I opened at Mozilla will dispute your contention that Chrome uses more memory. Simply not true!
Did you not look at the memory usage charts from Tom's Hardware? Chrome uses more memory than other browsers. This has been my consistent experience as well as Tom's Hardware's as well as most everyone's. Look at another memory usage chart from Tom's. They use Chrome's memory usage tool to measure it. Even Google disagrees with you.