For those who have problems with Facebook, Youtube and VK, must use the mobile version
m.facebook.com
m.vk.com
In youtube you must change the user agent, because will redirect you to youtube.com
about:config > general.useragent.override.youtube.com > Mozilla/5.0 (iPhone; CPU iPhone OS 10_3_1 like Mac OS X) AppleWebKit/603.1.30 (KHTML, like Gecko) Version/10.0 Mobile/14E304 Safari/
Forum:
K-Meleon on Goanna