No, dropping an active toaster into the ocean would not kill everything in the ocean. While it's not a good idea to introduce electronic devices like toasters into natural ecosystems like the ocean, the impact of a single toaster would be localized and minimal compared to the vastness of the ocean and its diverse ecosystem.
Toasters are electrical appliances that pose a risk of electric shock when connected to a power source, and they can be hazardous to marine life if they release toxic materials or contribute to pollution. However, once submerged, the toaster would quickly short-circuit due to the water, rendering it inactive.
The ocean is vast and resilient, and natural processes would eventually take care of any localized pollution or potential harm caused by a single toaster. However, it's essential to avoid introducing human-made objects into natural environments, as they can have unintended consequences and contribute to pollution. Proper waste disposal and responsible environmental practices are crucial for the health and preservation of marine ecosystems.