I personally miss in Firefox an Autofill feature, as there is in Safari or Chrome. And also autocomplete is supported only partly in Firefox.
It is only available for login Data and Credit Card Information, but not for the Standard Information as name or personal address data.
It would be great, if that would be available in one of the next updates.
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I understand some people use the built-in password manager. I rather use a third-party one, which already has an extension that works very well in Firefox (1Password). For me, it would be perfect if I could use my password manager in Thunderbird.
Actually address autofill is already available in Firefox Desktop but for some reason it's only available in the US and Canada. I don't understand why this is not available more widely. You can enable this for your region by going to about:config and then looking for "autofill" and adding your region to the list:
The autofill cannot be enabled in Firefox Mobile though, so I'm still upvoting this suggestion as hopefully this will be added at some point... It's such an useful, time-saving feature - it should be rolled out to more countries. Please consider this Firefox devs.