This might be related to https://bugzilla.mozilla.org/show_bug.cgi?id=964213, although that bug is old and without recent activity.
I am now able to reliably observe the problem in a disco VM. When I open the downloads popup and click on the retry icon, saving the page works. Jani, can you confirm this is the case for you too? Would you mind filing a new bug upstream describing the issue, and link to it here? https://bugzilla.mozilla.org/enter_bug.cgi#h=dupes%7CFirefox Thanks! ** Bug watch added: Mozilla Bugzilla #964213 https://bugzilla.mozilla.org/show_bug.cgi?id=964213 ** Changed in: firefox (Ubuntu) Status: Incomplete => Confirmed ** Changed in: firefox (Ubuntu) Importance: Undecided => Medium -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1820514 Title: Saving a web page from Tom's Hardware forums fails To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1820514/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs