Hi,
Am 5. September 2016 14:31:45 MESZ, schrieb Tony Baldwin <tonybaldwin@gmx.com>:
I have done
sudo update-alternatives --config x-www-browser about 50 times in this
past week, and chosen chromium-browser as my goto/default, but links
>from icedove keep opening in iceweasel, no matter what.
???
Most GUI applications don't use x-www-browser (which is what update-alternatives controls) but either the xdg mime association system or mailcap. For icedove it's the former.
In your case, running
xdg-mime default chromium.desktop x-scheme-handler/http
x-scheme-handler/https text/html
as a the user for which this should be set should do the trick.