Is it a possibility that BB153 and BDE209 could be a factor in the Tasmanians devil facial tumour disease?

Absolutely. Scientists have found abnormally high levels of the carcinogenic flame retardant chemicals BB153 and BDE209 in fat tissue from a number of Tasmanian devils. Because Tasmanian devils are limited to the island of Tasmania, there is less and less genetic diversity, meaning the Tasmanian devils' immune systems are unable to combat the disease.