Thunderbird Custom Folder Colours userChrome.css

/* Custom Folder Colours */
/* All non-special folders, e.g those you create */
treechildren::-moz-tree-image(folderNameCol){
  fill: #663300 !important;
}

/* Mailbox icons next to the account names */
treechildren::-moz-tree-image(folderNameCol, isServer-true) {
  fill: #00b386 !important;
}

/* Inbox */
.tabmail-tab[type="folder"][SpecialFolder="Inbox"],
treechildren::-moz-tree-image(folderNameCol, specialFolder-Inbox) {
  fill: #0da50d !important;
}

/* Sent */
.tabmail-tab[type="folder"][SpecialFolder="Sent"],
treechildren::-moz-tree-image(folderNameCol, specialFolder-Sent) {
  fill: #ff4000 !important;
}

/* Trash */
.tabmail-tab[type="folder"][SpecialFolder="Trash"],
treechildren::-moz-tree-image(folderNameCol, specialFolder-Trash) {
  fill: #ff0000 !important;
}

/* Junk */
.tabmail-tab[type="folder"][SpecialFolder="Junk"],
treechildren::-moz-tree-image(folderNameCol, specialFolder-Junk) {
  fill: #ff0066 !important;
}

/* Archives */
.tabmail-tab[type="folder"][SpecialFolder="Archive"],
treechildren::-moz-tree-image(folderNameCol, specialFolder-Archive) {
  fill: #b300b3 !important;
}

/* Templates */
.tabmail-tab[type="folder"][SpecialFolder="Templates"],
treechildren::-moz-tree-image(folderNameCol, specialFolder-Templates) {
  fill: #1a1aff !important;
}

/* Drafts */
.tabmail-tab[type="folder"][SpecialFolder="Drafts"],
treechildren::-moz-tree-image(folderNameCol, specialFolder-Drafts) {
  fill: #751aff !important;
}

/* Outbox */
.tabmail-tab[type="folder"][SpecialFolder="Outbox"],
treechildren::-moz-tree-image(folderNameCol, specialFolder-Outbox) {
  fill: #ff4000 !important;
}

/* Saved Search Folder */
.tabmail-tab[type="folder"][SpecialFolder="Virtual"],
treechildren::-moz-tree-image(folderNameCol, specialFolder-Virtual) {
  fill: #33cccc !important;
}