The developer tweeted the news last night:
BIG NEWS!! All versions of Flash are blocked by default in Firefox as of now.
However, Schmidt noted that this does not mean that Flash will be blocked by default going forward.
To be clear, Flash is only blocked until Adobe releases a version which isn't being actively exploited by publicly known vulnerabilities.
The news comes just as Facebook's Chief Security Officer Alex Stamos called for an end-of-life date for Flash saying, "It is time for Adobe to announce the end-of-life date for Flash and to ask the browsers to set killbits on the same day".
Apple has long discouraged the use of Flash with Steve Jobs revealing that "We also know first hand that Flash is the number one reason Macs crash", in his 2010 Thoughts on Flash.
Here's what Adobe said about the latest vulnerabilities found in Flash: