erc-track-faces-normal-list

erc-track-faces-normal-list is a variable defined in `erc-track.el'.
Its value is

((erc-button erc-default-face)
 (erc-nick-default-face erc-dangerous-host-face)
 erc-dangerous-host-face erc-nick-default-face
 (erc-nick-default-face erc-default-face)
 erc-default-face erc-action-face)

Documentation:
A list of faces considered to be part of normal conversations.
This list is used to highlight active buffer names in the mode line.

If a message contains one of the faces in this list, and the
previous mode line face for this buffer is also in this list, then
the buffer name will be highlighted using the face from the
message. This gives a rough indication that active conversations
are occurring in these channels.

The effect may be disabled by setting this variable to nil.

You can customize this variable.