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The U2F API can be re-enabled using the 2f preference. The U2F protocol remains usable through the WebAuthn API. The deprecated U2F Javascript API is now disabled by default. Now, that same shortcut will restore the previous session if there are no more closed tabs from the same session to re-open. You've always been able to un-close a tab by using (Cmd/Ctrl)-Shift-T. Do you use the tab list panel in the tab bar? If so, you can now close tabs by middle-clicking items in that list. Currently, this will only work if Firefox is not also installed as a Snap package, but work is underway to address this! Ubuntu Linux users can now import their browser data from the Chromium Snap package.
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Right-clicking on password fields now shows an option to reveal the password.
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