how do I narrow the left-sidebar that lists my folders?
I want to reduce the width of the box to the left of the email message list, that lists folders and tasks (i.e., "Compose Mail," "Contacts," "Inbox," etc.) How to do that?
Wšykne wótegrona (2)
Not a part of Firefox, part of your web mail display. Best to ask about that with support for your web mail service provider.
Unless you are talking about Thunderbird?
go to Tools Menu -> Content -> place Checkmark on "Enable Java Scripty' -> click "Advanced" -> place Checkmarks on Options 1,3 -> Ok -> OK
Check and tell if its working.