Hi Axel,
Yesterday, I have released Dillo 3.1.1 which includes some bug fixes,
see the release notes here:
https://dillo-browser.github.io/release/3.1.1/
The previous 3.1.0 release has been included in most major repositories
and 3.1.1 is being updated quickly:
https://repology.org/project/dillo/history
I'm no very familiar with Debian packages, but I can try to prepare one
for 3.1.1 if you are open to it.
I saw that you were also on the old mailing list which is now hosted
in mailman3.com, in case you want to take a look and maybe join again:
https://lists.mailman3.com/postorius/lists/dillo-dev.mailman3.com/
Best,
Rodrigo.