Tasmanian devils do not eat plants. They are completely carnivorous.
No. See the related question.
Yes: Tasmanian devils eat rabbits, as well as other small mammals.
Foxes can be predators of young Tasmanian devils. They are no match for an adult Tasmanian devil.
Tasmanian devils do not eat other live Tasmanian devils. They will, however, readily feed on the carcass of another Tasmanian devil that has died.
Tasmanian tigers, more correctly known as Thylacines, do not eat Tasmanian devils. Thylacines are extinct. Prior to the Thylacine's extinction, the two species were both at the top of the food chain, and Thylacines did not eat Tasmanian devils then, either.
Tasmanian devils eat possums
No doubt the indigenous Tasmanian Aboriginal people ate Tasmanian devils from time to time. However, it is illegal to harm - let alone eat - a Tasmanian devil now.
Tasmanian devils became protected by law in June 1941. After this, it became illegal to hunt or trap Tasmanian devils.
Tasmanian Devils live in Tasmania, the island state of Australia. Their habitat is coastal heath, open dry sclerophyll forest and mixed sclerophyll-rainforest. Tasmanian Devils eat snakes, birds, rodents, lizards and wallabies. A lot of insects, larvae and especially carcasses or dead animal bodies are eaten by the Tasmanian devils. Mainly Tasmanian Devils eat whatever is available.
Dingoes do not eat Tasmanian devils. There are no dingoes on the Australian island of Tasmania, and there are no Tasmanian devils remaining on the Australian mainland. When the two species co-existed on the mainland, scientists do not believe that dingoes took on Tasmanian devils as predator to prey, but that the two species were competitors for food.
Humans should save Tasmanian Devils because they eat the sick and dead animals.