Puntuado con 5 de 5 estrellas

I installed a second copy of Thunderbird (v45.0) after downloading it from: http://ftp.mozilla.org/pub/thunderbird/releases/

Doing so does NOT remove your current version. By using the older version, I was able to install Quicktext which then works with both versions (I'm also using v52.5).

Esta valoración es de una versión anterior del complemento (0.9.11.7). 

Latest quicktext works with TB52 and TB60 again.