No, you should not microwave Vaseline (petroleum jelly) in its own plastic container or any other plastic container. Vaseline is an oil-based product, and microwaving it in a plastic container can be hazardous for a few reasons:
Fire hazard: Petroleum jelly is flammable, and when exposed to high temperatures in a microwave, it can catch fire. Plastic containers may not be able to withstand the heat, and the combination of high temperatures and flammable substances can lead to a fire in the microwave.
Plastic melting and release of toxins: Most plastic containers are not designed to be heated in a microwave and may melt or release harmful chemicals into the Vaseline or the microwave.
If you need to warm up Vaseline for any reason, it's safer to transfer a small amount into a microwave-safe glass or ceramic container and warm it up in the microwave for short intervals on low power. Alternatively, you can place the plastic container with Vaseline into a bowl of hot water to gently warm it up.
Always exercise caution when heating any substance in the microwave and follow proper safety guidelines to prevent accidents or harm.