I have verified this issue on the latest Nightly 71.0a1 (Build ID: 20191013213650) and on Firefox Beta 70.0b14 (Build ID: 20191014213051) on Windows 10 x64, Mac 10.14, Ubuntu 16 x64. - The saved logins are correctly displayed in the “Login List” from “about:logins” page after signing in to Sync.
Bug 1587737 Comment 13 Edit History
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I have verified this issue on the latest Nightly 71.0a1 (Build ID: 20191013213650) on Windows 10 x64, Mac 10.14, Ubuntu 16 x64. - The saved logins are correctly displayed in the “Login List” from “about:logins” page after signing in to Sync.