(My) original report on Launchpad: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1820514

Any page under https://forums.tomshardware.com/ seems to trigger this, but I have yet to come across other sites that do. Pages can even be saved from the main Tom’s Hardware domain (https://www.tomshardware.com/) without issues.

A workaround discovered by Olivier Tilloy: clicking retry in the download manager completes the save.

Steps to reproduce:

1. Open https://forums.tomshardware.com/threads/what-is-the-actually-difference-between-udimm-and-dimm.1575984/
2. Right-click and select ’Save page as’. Point the dialog to your directory of choice.

Actual results:

There’s no copy of the page in the target directory. Going to about:downloads reveals that the download has failed, without further details.

Expected results:

For the directory to contain a downloaded copy of the page.

== Steps to reproduce ==
1. Open https://forums.tomshardware.com/threads/what-is-the-actually-difference-between-udimm-and-dimm.1575984/
2. Right-click and select ’Save page as’. Point the dialog to your directory of choice.

== What I expect to happen ==
For the directory to contain a downloaded copy of the page.

== What happens ==
There’s no copy of the page in the target directory. Going to about:downloads reveals that the download has failed, without further details.

== Other info ==
I’m reporting this from up-to-date Disco, albeit with a 4.* kernel (as gdm currently fails to start in my VirtualBox VM with 5.*) but it’s equally reproducible in Bionic.

Any page under https://forums.tomshardware.com/ seems to trigger this, but I have yet to come across other sites that do. Pages can even be saved from the main Tom’s Hardware domain (https://www.tomshardware.com/) without issues.