Fill finds the email box on more sign up forms, and no longer writes into a name or search box.
Fill code only goes into a page of the site that sent the code. A code from another site is there to copy, with a warning.
The code card only shows mail that came after you filled, even when your computer's clock is off.
Copying or filling a code, or opening its link, marks the mail read, so the number on the icon goes down.
When the shortcut or the right click item can't fill a page, the icon shows "!" and the popup says why.
Signing out no longer makes a new empty inbox, and signing in keeps the inbox you were on.
Locked and paused inboxes say so in the inbox list, which now has a Back button.
The popup checks for new mail less often when nothing changes, and says so when it can't connect.

Opening a mail now marks it read, so the number on the icon goes down.
Sign out is in a new menu under your initial.
The number on the icon counts all your unread mail and keeps updating after a browser restart.
Invite friends from the menu. You both get 1 more inbox when they join.
Sign in on the extension once and get 1 more inbox.

Fixed the large icons so the logo shows on the add-ons page.