Not sure why debian testing still offers icedove 10.x while stable is already on 17.x but I’m not going to backport my very own packages. Luckily there’s a dedicated mozilla repository by debian maintainers to get a more recent icedove version.

# echo "deb unstable main" >> /etc/apt/sources.list.d/mozilla.list
# apt-get update
# apt-get install icedove iceowl-extension
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