Recently, Firefox 60 and Thunderbird 60 were made available for Debian Testing and I installed them. While I was and still am happy with Firefox 60, when I tried Thunderbird I had some issues… Basically, I was not able to send a message and one of my favorite add-on, Markdown-Here, was not available for this version 😢. So, I needed to get the previous version back. I searched for an answer and found this one, very helpful! So I checked the version available using apt-cache policy:

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$ apt-cache policy thunderbird
thunderbird:
 Installed: 1:60.0-3~deb9u1
 Candidate: 1:60.0-3~deb9u1
 Version table:
*** 1:60.0-3~deb9u1 500
       500 http://security.debian.org stable/updates/main amd64 Packages
       100 /var/lib/dpkg/status
    1:52.9.1-1 500
       500 http://debian.mirror.rafal.ca/debian testing/main amd64 Packages
    1:52.8.0-1~deb9u1 500
       500 http://ftp.debian.org/debian stable/main amd64 Packages

1:52.9.1-1 500 means version 1:52.9.1-1 is installable, and it was the one I was looking for to re-install Thunderbird (btw in 100 /var/lib/dpkg/status 100 indicates the version installed):

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$ sudo apt-get install thunderbird=1:52.9.1-1  
[...]
$ thunderbird -v                                
Thunderbird 52.9.1

YEAH🎆🎆! Plus, in order to prevent from re-installing version 60, I marked version 52:

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$ sudo apt-mark hold thunderbird     
[sudo] password for kevcaz:
thunderbird set on hold.

I’ll wait some weeks and the new version of Markdown Here that should come soon before installing version 60 and its new features 😺.