gecko-dev/penelope/themes/pinstripe/mail/penelope.css

treechildren::-moz-tree-cell-text(statusCol) {
  text-align: right;
  padding-right: 1000em;
}

treechildren::-moz-tree-cell-text(priorityCol) {
  text-align: right;
  padding-right: 1000em;
}

treechildren::-moz-tree-image(statusCol, read) {
  list-style-image: none;
  padding-left: 5px;
}

treechildren::-moz-tree-image(statusCol, unread) {
  list-style-image: url("chrome://penelope/skin/icons/tbar16a.png");
  -moz-image-region: rect(0px 528px 16px 512px) !important;
  padding-left: 5px;
}

treechildren::-moz-tree-image(statusCol, forwarded) {
  list-style-image: url("chrome://penelope/skin/icons/tbar16a.png");
  -moz-image-region: rect(0px 574px 16px 558px) !important;
  padding-left: 5px;
}

treechildren::-moz-tree-image(statusCol, replied) {
  list-style-image: url("chrome://penelope/skin/icons/tbar16a.png");
  -moz-image-region: rect(0px 558px 16px 542px) !important;
  padding-left: 5px;
}

treechildren::-moz-tree-image(statusCol, new) {
  list-style-image: url("chrome://penelope/skin/icons/tbar16a.png");
  -moz-image-region: rect(0px 528px 16px 512px) !important;
  padding-left: 5px;
}

treecol.statusColumnHeader {
  -moz-appearance: none !important; /* grrrr! */ 
  list-style-image: url("chrome://penelope/skin/icons/SortByStatus.png");
  width: 30px
}

treechildren::-moz-tree-cell-text(priorityCol) {
  overflow: hidden !important;
}

treechildren::-moz-tree-image(priorityCol) {
  list-style-image: url("chrome://penelope/skin/icons/tbar16a.png");
  -moz-image-region: rect(2px 46px 14px 34px) !important;
  padding-left: 5px;
}

treechildren::-moz-tree-image(priorityCol, priority-high) {
  list-style-image: url("chrome://penelope/skin/icons/tbar16a.png");
  -moz-image-region: rect(2px 30px 14px 18px) !important;
  padding-left: 5px;
}

treechildren::-moz-tree-image(priorityCol, priority-highest) {
  list-style-image: url("chrome://penelope/skin/icons/tbar16a.png");
  -moz-image-region: rect(2px 14px 14px 2px) !important;
  padding-left: 5px;
}

treechildren::-moz-tree-image(priorityCol, priority-low) {
  list-style-image: url("chrome://penelope/skin/icons/tbar16a.png");
  -moz-image-region: rect(2px 62px 14px 50px) !important;
  padding-left: 5px;
}

treechildren::-moz-tree-image(priorityCol, priority-lowest) {
  list-style-image: url("chrome://penelope/skin/icons/tbar16a.png");
  -moz-image-region: rect(2px 78px 14px 66px) !important;
  padding-left: 5px;
}

treecol.priorityColumnHeader {
  -moz-appearance: none !important; /* grrrr! */ 
  list-style-image: url("chrome://penelope/skin/icons/SortByPriority.png");
  width: 30px
}

treecol.junkStatusHeader {
  -moz-appearance: none !important; /* grrrr! */ 
  list-style-image: url("chrome://penelope/skin/icons/SortByJunk.png");
  width: 30px
}

treecol.attachmentColumnHeader {
  -moz-appearance: none !important; /* grrrr! */ 
  list-style-image: url("chrome://penelope/skin/icons/SortByAttachment.png");
  width: 30px
}

treechildren::-moz-tree-image(attachmentCol, attach) {
  list-style-image: url("chrome://penelope/skin/icons/tbar16.png");
  -moz-image-region: rect(0px 304px 16px 288px) !important;
  padding-left: 5px;
}

treecol.tagsColumnHeader {
  -moz-appearance: none !important; /* grrrr! */ 
  background-image: url("chrome://penelope/skin/icons/SortByLabel.png") !important;
  background-repeat: no-repeat; 
  background-position: left center;
  padding-left: 20px; 
  text-align: left;
}

treecol.subjectColumnHeader {
  -moz-appearance: none !important; /* grrrr! */ 
  background-image: url("chrome://penelope/skin/icons/SortBySubject.png") !important;
  background-repeat: no-repeat; 
  background-position: left center;
  padding-left: 20px; 
  text-align: left;
}

treecol.dateColumnHeader {
  -moz-appearance: none !important; /* grrrr! */ 
  background-image: url("chrome://penelope/skin/icons/SortByDate.png") !important;
  background-repeat: no-repeat; 
  background-position: left center;
  padding-left: 20px; 
  text-align: left;
}

treecol.recipientColumnHeader {
  -moz-appearance: none !important; /* grrrr! */ 
  background-image: url("chrome://penelope/skin/icons/SortBySender.png") !important;
  background-repeat: no-repeat; 
  background-position: left center;
  padding-left: 20px; 
  text-align: left;
}

treecol.senderColumnHeader {
  -moz-appearance: none !important; /* grrrr! */ 
  background-image: url("chrome://penelope/skin/icons/SortBySender.png") !important;
  background-repeat: no-repeat; 
  background-position: left center;
  padding-left: 20px; 
  text-align: left;
}

treecol.sizeColumnHeader {
  -moz-appearance: none !important; /* grrrr! */ 
  background-image: url("chrome://penelope/skin/icons/SortBySize.png") !important;
  background-repeat: no-repeat; 
  background-position: center center;
  padding-left: 20px; 
  text-align: left;
}