That cheater plug is probably not worth the risk.

No, it’s not safe in most cases. You’re removing the ground path, which is the whole point of a three-prong plug. If your device has a metal case or draws significant power, you’re gambling with shock hazard.

Cheater plugs exist for a reason: older homes with two-prong outlets. But they only work safely if the outlet box is grounded and the adapter’s little metal tab is actually screwed into the cover plate screw (which connects to the box ground). Most people don’t do that, and with an extension cord in the middle, you’re adding resistance and potential failure points.

If you really need to plug a three-prong device into a two-prong outlet, your best bet is a GFCI outlet or a GFCI-protected extension cord. That gives you ground-fault protection without a physical ground wire. Otherwise, find an outlet that’s properly grounded or call an electrician to swap the outlet.

Cheater plugs are a temporary hack, not a solution.