It allows you to erase your browser history/cookies for 5 minutes, 2 hours, or 1 day, in case you want your browser to be able to unsee wherever it is that you've blundered into.
There's also a new search option for Duckduckgo, a privacy-oriented search tool, as well as paid advertising ("sponsored tiles") on empty browser windows. There's also a new, developer-oriented version of Firefox launched to coincide with the tenth anniversary of the browser, filled with experimental, cutting-edge tools.
Mozilla updates Firefox with Forget button and DuckDuckGo search, rolls out sponsored tiles to new tab page [Emil Protalinski/Venturebeat]
(via /.)
