I don't know what the future holds, but in Firefox 71, the old dialog is still lurking and can be reinstated with a couple settings changes. Here's how:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.

(2) In the search box above the list, type or paste signon and pause while the list is filtered

(3) Double-click the signon.management.page.enabled preference to switch the value from true to false

(4) Double-click the signon.management.overrideURI preference to display an editable text field, remove the entire URL, then press Enter/Return to save or click the blue checkmark button

Then when you click the Saved Logins button, you should get the old popup-style dialog.

Note: to undo the UI change, return to the about:config screen and click the Reset button at the far right of each of the two rows.

The signon.management.page.enabled preference Does not exist. Also, the url for the signon.management.overrideURI has already been deleted. Refer to the image I to see what there is.

Hello,

Type about:logins in URL bar and press enter. You will see your all Saved Logins.

Hope it helps. Thanks.

That gives me Lockwise. That is not what I want. I want the earlier listing of websites and passwords, that show everything. Would it help if I inserted signon.management.page.enabled into about:config ? Somehow it may have been accidentally deleted some time ago.

See this Article Reset Firefox preferences to troubleshoot and fix problems

Support for the old password manager (passwordManager.xhtml) has been removed in Firefox 77, so it is no longer possible to switch to the old laytout.