In isolation, the photos in the carousel would not lead me to believe that Mozilla is virtue signaling as the photos are just pictures of people. The aggregate message from their ad copy and the specific choice to use loaded terms is what made me aware that they wanted to employ this strategy.

However, to be cheeky, if you wanted to talk solely based on which photos passed editorial approval, compare those represented to the physical attributes of their leadership team: https://blog.mozilla.org/press/media-library/bios/