|User since||Jan. 8, 2018|
|Number of add-ons developed||0 add-ons|
|Average rating of developer's add-ons||Not yet rated|
Rated 5 out of 5 stars
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).