Notifications alert you to different kinds of interesting events. There are two notification icons at the bottom or top of the Viewer window:
Speech Bubble: Conversations. Instant Messages (IMs) are text chat received from other Residents and groups. Each distinct IM session also appears to the left of Conversations, indicated by a thumbnail of a Resident's profile or group's insignia.
Envelope: Notifications. All other notifications, such as an inventory delivery after you've bought an item, or when an object has been returned from a parcel to you. Some notifications have special thumbnails that appear to the left of the notifications icons: For example, a received object is shown as a cube.
Clicking on the envelop icon results in a window opening. this lists pending notifications by type:
System: Notifications such as object return, etc.
Transactions: Sales or purchases
Invitations: Group invitations
Group: Group notices.
To prevent clutter, notifications appear briefly, then are hidden until you click the Conversations or Notifications cliclets. Click a notification in the queue to view it in full. The notification count is shown layered over each icon.
Click the circled X in the top right of a notification to remove it.
See this page for documentation on Firestorm 4.7.3 (47323) and earlier.