For Chrome, I use Adblock and then block specific elements. After you install Adblock, right-click on the element and select Block this Ad.
This will block those annoying "x new" messages.
Adblock for Chrome:
https://chrome.google.com/webstore/detail/adblock/gighmmpiobklfepjocnamgkkbiglidom
For Firefox, use Adblock Plus + Adblock Plus Element Hiding Helper.