Onion services icons are gray even if secure connection icons should be green
There is an option in Tor Browser to make HTTPS padlocks be green again if set to false, called security.secure_connection_icon_color_gray
.
If this option is set to false, HTTPS padlocks become green, but onion services icons are still gray.
However, I think this option will be removed soon (also, Google has plans to remove padlocks from Chrome in the future), like they removed EV green bars option.