Careful, this is really not good for folks who are color blind. In chromium devtools you can enable various color blind emulations in the device emulation menu. ctrl+shift+P -> "Protanopia"
Ohhh, that's a great tool that I didn't know existed. I've used GPU-based filters in the past for this.
For others - this panel is shown at the bottom, alongside the "Console" panel (not the "Console" tab at the top!) that's sometimes shown. You can open it by clicking the three vertical dots at the top right of the devtools panel, "More tools", then "Rendering".
The setting you're looking for is "Emulate vision deficiencies".
