2. In the message editor
3. When quoting, there are huge empty lines before the quote
4. Clicking "edit" on messages does nothing (if you click "edit" twice, the extended edit window opens, no issues there). Possibly, the problem is related to the page loading quite slowly, and it's not certain it loads successfully to the end. On this page, for example, I have this issue, though as far as I can check, it happens on any page where my messages are.
5. When increasing experience points by clicking the quick bird icon. The experience points do increase, but it's only visible after reloading the page.
6. In private messages, there is no longer autocomplete for nicknames in the address field.
As always, latest Firefox, Windows 10.