A few more small things:
I see no indication how full my mailbox is now.
If I use middle-click to open a thread in a new tab (standard Firefox feature) the page is garbled, with the reply box overlaying the first message and the rest blank and unreadable (just as it is following a message with attachment, as described above). If I right-click and choose "Open in new tab" it loads properly.
The "colored cap-letter" defaults for people with no avatar are ugly and distracting, and it would be nicer to have nothing as before (or maybe a blank grey circle).
I don't like having a blue background on alternate posts, it just makes them harder to read. And sometimes it seems random instead of alternating, as on this page where #23 is blue but #21 is not:
https://www.birdforum.net/threads/an-evaluation-of-the-nl’s-performance-from-poland.396651/page-2#post-4092888
Edit: when I pasted in the above URL it did not convert into a URL. It began "URL unfurl=true", which results in this:
Dennis your beautiful observation is useless if you don't know how far your pupils will open in the dark! Mine still open to 6.8mm. So I can use the 8x56 almost fully and the SLC 8x56 can be used much longer at dusk than an 8x30! In addition, they should respect that other participants do not...
www.birdforum.net