@edgrbnz Thanks for your Answer!
indeed i disabled the option.
But I did enable the resized image version as of now to show you what I mean. Its very visible on my screen, the skin tones really look ridiculous in Firefox if I have them exported in sRGB and then resized by Wordpress backend. Could you check if you see it as well? Its most visible on white gamut screens. Thanks!
Weird for me is that if I export them in AdobeRGB (which shouldn't be the case for Web) the images actually look better in firefox (but worse in safari compared to sRGB) - for that matter I did a project to compare sRGB and AdobeRGB.
Thanks for the max-with tip in css I was thinking the same, but I wasn't sure if there is a laytheme option or checkbox to disable that oversizing. But I guess there isn't.
But it should be possible to assign that max-with option globally with css as well I guess (I would like it to not oversize the images anywhere)