My questions

[toxrq]

Please tell me how I can get rid of these fireflies?
Increase render time, does not improve.
material chrome
Diff 0/0/0 level 0.7
Refl 255,255,255 level 1 Gloss 0.7
other options defaul
light CoronaSun

I7 860 @ 3200
Render time: 5:05
Passes: 233

[johan belmans]

Remove the glass from the window and render again.
Use Region renderer to quickly see the result.

[toxrq]

Thank you Belly! But it did not help.

[johan belmans]

mmmhhh,
are their curtains in front of the window? I mean the blurry horizontal stripes?
Try to use an HDRI instead of the corona sun?
Just a guess

[muchobg]

Hi ,
try to use your windows with translucency fraction to 1 and hdr environment like belly say.

[Ludvik Koutny]

Hi ,
try to use your windows with translucency fraction to 1 and hdr environment like belly say.

Do not ever do that.

[Coronaut]

Try hiding sun emitter in corona sun properties.

[toxrq]

In this scene helped me.
off "Visible in reflection"
Thank you.
Are there ways without cheating?

Excuse my bad English)