Connecting to http://javatester.org/ results in Iceweasel locking up.
Attempting to run the radar loop from
http://radar.weather.gov/radar.php?rid=akq&product=N0R&overlay=11101111&loop=no
results in a blank frame. Note: the radar download worked on a previous version
of Iceweasel, with a privious version of JAVA.

src:iceweasel has been superseded by src:firefox-esr in version
45.0esr-1 in March 2016. Transitional packages to ease upgrades were
provided in the wheezy, jessie, stretch and buster releases. The
transitional packages have been removed finally before the bullseye
release in August 2021.
After regular security support for buster ended in August 2022 and LTS
support ended in June 2024, I'm closing the remaining bug reports now.

Andreas