Re: Webmail 1.4.7 & Yahoo 1.5.7 Addons working before TB15.0

[jr78]

Remember that the Author also wants to keep in place backwards 
compatiblity. This is going to take some real coding magic. The reason 
being is this, Mozilla says they have now plugged the main cause of memory 
leaks in Firefox add-ons. Add-ons commonly hold extra copies of sites in 
memory when they don't need to, and the browser now has a mechanism to 
detect this and reclaim the memory. I would believe this to be true for 
Thunderbird too.