These errors must be corrected by the person who uploaded the game.
Itch provides the appropriate headers, but the person who uploaded the game must activate the corresponding flags in Itch, there are a couple of posts in this same forum that explain in detail how to do this.
There is nothing you as a player can do except notify the developers of each game that gives you the error.
Things to try.
Start it in a new incognito tab in Chrome.
Make an additional new blank Chrome profile without any extensions.
Deactivate / Activate the hardware accellearation in Chrome.
Try Opera.
Itch changed something with their servers a while back, including stuff that might or might not affect those shared array stuff. I do not know if there are any solutions, but there are threads in forum about this and certain issues.
