Monitor profiles and deep shadow tonality

Yes.

I looked into this again yesterday. Chrome had a basic (i.e. broken, because IMHO it’s not color management if its only partial(ly implemented)) color management a long time ago, and then it was removed. Now as of version 61 it has support for a monitor profile, but with some severe limitations - I don’t know how it detects the “system profile” whatever that means, it doesn’t tell me which profile it detected, it doesn’t let me choose the rendering intent, it doesn’t let me turn on/off black point compensation, and it doesn’t let me specify my own monitor profile. I asked about these things in their issue trackers, see:
https://bugs.chromium.org/p/chromium/issues/detail?id=755747#c59

I also confirm that the image in Google Chrome 63.0.3239.84 looks like the image in Geeqie when color management is turned off, i.e. despite me having my monitor profile set in the X11 atom and despite having chrome://flags/#force-color-profile set to “default”, it does not work.

i.e. no surprise there, color management still doesn’t work in Chrome.

See Mr Robot add-on in Firefox - very disturbing!

I use the latest git. To get it, just run this script: https://filebin.net/crtc5rjxy65hg7cw/build-geeqie
Looks like this: https://i.imgur.com/4JwKHkd.png