Adblock Plus breaks Firefox's "Save Page As..."

[heynnema]

Ubuntu 18.10
Firefox 63
Adblock Plus 3.4

Recently my Firefox errored out when doing a "Save Page As..." from the right-click contextual menu. The folder of images was created, but the main .html page was missing. Firefox's download icon indicated an error.

Disabling Adblock Plus was the only way to allow "Save Page As..." to work normally.

Please advise.

[mapx]

What page did you want to save ? or does it happen whatever page you visit ?

[heynnema]

Sorry for the long delay to reply. I was never notified there was activity on my question. The problem occurs on every web page where I've tried to "Save page as...".