User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0 Build ID: 20170323105023 Steps to reproduce: Went to a page that is used for webmail login on my domain. Actual results: The new (since FF 52) processing automatically opened the username dropdown list. I was able to scroll down through the saved login but the scrolling stopped at the 20th entry. I administer my domain users' email though this webmail interface so I have about 50 saved logins. If I begin to type any of the logins that are past user #20, Firefox does autofill so clearly it still remembers the entire saved list of usernames/passwords. Expected results: The dropdown box needs to allow access to all saved entries for that page, not just the first 20 entries.
I can confirm that this is also a problem for me. The dropdown isn't showing all the saved logins. Firefox 52.0.2 Windows 10 Pro v1703, Build 15063.138
Hooray, fixed in 54.0! Thank you so much!