I always use the current version of Firefox. But more and more that I find question marks in the text. I don't think its Frefox, I think its a minor fault in CB+. Especially since Its now happening when I view other people's posts. It also happened when I open CB+ in VIVALDI browser.
Now you mention it, here is another problem I have, say I create a post, close it, post it, and then 10 minutes later go back and open the post to modify it. [And its great that you can do that in CB+] I often find miscellaneous characters in the text that I have to get rid of before I can repost the text. I also think that is something to do with CB+ itself. It doesn't happen anywhere else.