Memory leak over time, while tab with the game in focus

[Areso]

Working workaround: change tab for awhile (2 minutes or so), and minimize browser to be sure. At least FF will clear RAM.
Issue also confirmed in Chrome.
The reason is DOM (node list, which grows with each message in textarea).
Since GC can't be called, it's interesting thing to solve.

I guess the textarea could be empty()-ed after a specific amount of messages?

[Areso]

It was my first thought. Now I thinking to move messages, which are older than 1hour, to another element (for example some p or span id="messagesHistory")