3D FlipBook - 3D FlipBook - Lite Edition will not load on Mac Safari

I get error, "Your graphics card does not seem to support WebGl." - Mac Safari only!. WebGL on Chrome for same site works Don't jump to conclusions yet! MacBook (2006); OS Monterey 12.1, Safari 15.2 WebGL is NOT in Safari -> Preferences -> Websites Develop -> Experimental Features ----> WebGL 2.0 = SET; WebGL via Metal = SET Some suggestions on the internets seem to indicate that some deep setting accessible via Mac Terminal app may need to be changed. Thanks for any advice on this one.