It is set to yes.
Yes it was an extension. To check I disabled all extension, on another browser tab I had the board index page. Hey look the ONLINE ribbon thing showed up. So browser tab 1 I had the extensions list, I enabled one at the time then switched to browser tab 2 then refreshed. the ONLINE ribbon thing showed...until it turned to the green dot. It was the User Post Profile Side Selector extension. I disabled, deleted the data then removed the files.
You should report that to the extension author.
Report what? The feature of this extension?
The online images on posts, PM's and profiles are replaced with a Font Awesome icon next to the usernames.