Answering Siria from this post:
http://kmeleonbrowser.org/forum/read.php?19,148500,gotonewpost
I think the answer is implicit in the error itself
. Note that I don't use Whatsapp and never went to the web site before:
Gecko 52 or above (Firefox 52 and above, and I guess, I won't test, Seamonkey 2.49.x and above).
Edited 2 time(s). Last edit at 06/08/2020 12:08AM by JohnHell.