Why don't we use Mozilla ESR in Precise?

[Jo-Erlend Schinstad]

In Precise we've upgraded to version 11 of both Firefox and Thunderbird. 
But the reason for starting to upgrade frequently was said to be that 
Mozillas support periods were limited for newer versions after 3.6. But 
now we have the 10ESR versions of both. Why are they not used instead of 
the short-term 11?

Thanks

Jo-Erlend Schinstad