RAM usage with Flash Player 23 Beta (23.0.0.134) - Not sustainable

• Windows 7 Home SP1 (x64)
• Firefox
  • Release (Version 48.0) - 32bits
  • Beta (Version 49.0b3) - 64bits with e10s
  • Nightly (Version 51.0a1) - 64bits with e10s
• Flash Player version 23.0.0.134

I found that Flash Player 23.0.0.134 Beta leaks memory badly. No such issue with 23.0.0.126 Beta. Reproducible with clean browser builds (Beta and Nightly tested only in repeat testing).

I was watching Rio Olympics live streams  with 23.0.0.126, RAM usage was fairly steady. With 23.0.0.134, RAM steadily increased to 100% in about 30 minutes of steady streaming, completely used up the virtual memory until Windows started to shut down the browser.  Problem disappears after rolling back to 23.0.0.126 Beta.