Is it still possible?
It is, and you can be up and running within minutes.
(ZIP ARCHIVE CONTAINING BOTH PROGRAMS – COMPILED BY US) Windows Users – Pale Moon 29.4.1 Windows 64bit & Flash Player 32_0r0_371_win.msi (Zipped on October 7, 2021)
The following tutorial is from Reddit and you can access it yourself by clicking the link.
Download and install Pale Moon 64-bit (a web browser that didn’t drop support for Flash): Pale Moon Browser (Download Here)
Download and install the most recent version of Flash for Windows that Adobe didn’t kill (flashplayer32_0r0_371_win.msi): Web Archive (Download Here)