Another flash patch is expected to be released this week. The updated flash version is 126.96.36.1995
All that is currently known is available at https://helpx.adobe.com/security/products/flash-player/apsa15-02.html
Security Advisory for Adobe Flash Player
Release date: February 2, 2015
Vulnerability identifier: APSA15-02
CVE number: CVE-2015-0313
Platform: All Platforms
A critical vulnerability (CVE-2015-0313) exists in Adobe Flash Player 188.8.131.526 and earlier versions for Windows and Macintosh. Successful exploitation could cause a crash and potentially allow an attacker to take control of the affected system. We are aware of reports that this vulnerability is being actively exploited in the wild via drive-by-download attacks against systems running Internet Explorer and Firefox on Windows 8.1 and below.
Adobe expects to release an update for Flash Player during the week of February 2. For more information on updating Flash Player please refer to this post.
As an aside, from what I have read, HTML5 is now the default for youtube videos. I think only IE and chrome currently support HTML5 with the base install. Firefox requires a plugin – https://addons.mozilla.org/en-US/firefox/addon/youtube-all-html5/