Именно ...
... Firefox ESR 31.8.0 (НЕ ВЫШЕ) + AdobeFlashPlayer 10_83 (НЕ ВЫШЕ) + general.useragent.override= 64bit linux FF48.0 и вЭк - почти не глючит ..по крайней мере чаты и 720р видосы работают без висов c одним ядром 1.9 ГГЦ + 128 МБ Invidia и выключенном html5...только версию флеша нада завышать , чтоб вЭк думал , что стоит последняя версия , иначе если тупо поставить 10-тую версию флеша - работать небудет , а чтоб ее завысить - нада сначала установить последнюю версию флеша , а потом заменить рабочую *.dll-ку на 10тую (отредактированную и переименованую) и поудалять из папки установки все лишнее..чтоб получилось вот так
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версии лиса выше 31.8.0 и флэша выше 10_83 , а также наличие антивируса на одноядерных устройствах - будут глючить априори ..так что удачи Вам в настройке