Update UA override for Facebook to make it work a little better. 

[+] Change UA override for Facebook, to fix broken comment box.
[!] Minimalistic Opera Presto UA which seems to give a decent feature set while not having a broken comment box.

Sourced: https://github.com/MoonchildProductions/Pale-Moon/commit/938c913bdd7a85cdeae365d4c75dc2e48ad57e07