Quoteroytam1
for youtube going to mobile version, it is intended as normal version trends to freeze the browser. if you think it is still feel good to use normal version, then please go to about:config and change general.useragent.override.youtube.com to "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0"
and for the crashes, from my limited testing, I can
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K-Meleon on Goanna