However, by 2020, the risk profile led all major browser vendors to remove NPAPI/PPAPI support, effectively killing the web-based SWF viewer.

Ruffle is the most popular modern solution. It is a Flash Player emulator written in Rust that runs natively in your browser using WebAssembly.

Adobe released a standalone Flash Player projector. This is essentially a self-contained executable program that plays SWF files without needing a web browser.