Update Pale Moon & Flash
Have done this and find i can play any swf game including AS3 and in full screen...
A short guide to installing flash player in Pale Moon browser in 2021.
1) Install Pale Moon browser from homepage, it can be 32-bit or 64-bit version
2) Install older version of flash player from archive.org version Flash Player 32.0.0.371 file flashplayer32_0r0_371_win.exe inside downloaded zip. You may choose "Never check for updates" while installing. You may need to uninstall your current version of flash before installing this one. (I have attached this file to the post if you need it)
3) After installation create folder "plugins" in %PROGRAMFILES(X86)%\Pale Moon\browser folder and copy file C:\Windows\SysWOW64\Macromed\Flash\NPSWF32_32_0_0_ 371.dll there.
Flash will be working forever now even if you or windows will uninstall flash player from windows at later time.
Alternatively you can patch current newest version 32_0_0_465 of flash player, detailed description in forum
Pale Moon
https://www.palemoon.org/
Note: This might not work on any site with the Ruffle code installed if they have more than 1 skin then might have some without it installed otherwise should work without problems
Download - flashplayer32_0r0_371_win
http://www.filefactory.com/file/5p3uv049rzks/flashplayer32_0r0_371_win.zip
https://www20.zippyshare.com/v/RYQYkvI4/file.html
https://bayfiles.com/b1Fbc0D5pf/flashplayer32_0r0_371_win_zip
https://www.upload.ee/files/12809648/flashplayer32_0r0_371_win.zip.html
https://www.uploadcloud.pro/mkzp3c1yithx/flashplayer32_0r0_371_win.zip.html
https://up2sha.re/file?f=K3gQ47
https://yourfilestore.com/download/752197/flashplayer32_0r0_371_win.zip.html
https://mega.nz/file/aS4WkQqb#73tp6xvPobN6CgPqbvOgPj-orRO_PtaxZWtDWJvV5hc