/*
 
* Do not remove the @namespace line -- it's required for correct functioning
 */

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); 

/*

treechildren::-moz-tree-image(correspondentCol) {
  list-style-image: none !important;
  -moz-margin-start: -17px !important;
}

I'm still seeing the correpsondents column without arrows, but I'm using version 52.9.1 Have you just updated to use version 60 ? Located a bunch of info on 'Correpondents' column. https://www.thunderbird.net/en-US/thunderbird/52.0/releasenotes/ Info says: ''Correspondents column now default for all new folders, can be switched off with preference '''mail.threadpane.use_correspondents'''.'' * 'Menu icon (3lines) > 'Options' > 'Options' > 'Advanced' > 'General' tab * clickon 'Config editor' * It will say to be careful :) * In top search type: correspondents * look for : mail.threadpane.use_correspondents * double click on that line to toggle from 'True' to 'false' * close window - top right 'x' * click on 'OK' re: The 'Correspondents' column has arrows. You can choose to remove the column header 'Correspondents' column and use the 'From' column which shows same data but does not have arrows. see image below as guide. There is a way to use 'Correspondents' column without arrows but you would need to create and use a 'userChrome.css' file. I got info from this comment: https://bugzilla.mozilla.org/show_bug.cgi?id=1265446#c12 Make Hidden files and folder visible: * http://kb.mozillazine.org/Show_hidden_files_and_folders In Thunderbird: * Help > Troubleshooting Information * click on 'Open folder' button * a new window opens showing your Profile folder. * Close Thunderbird now - this is important. * Create new folder and call it '''chrome''' note the spelling - use a lower case 'c' It should be in the same place as the 'Mail' folder. * open Notepad: usually located under All Programs > accessories > Notepad * Copy all the text between lines below and paste it into the Notepad document. ------------------------ <pre> /* * Do not remove the @namespace line -- it's required for correct functioning */ @namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* treechildren::-moz-tree-image(correspondentCol) { list-style-image: none !important; -moz-margin-start: -17px !important; } </pre> ---------------------- * Save the document as filename '''userChrome.css''' in the '''chrome''' folder. Note the spelling all lower case except for the 'C'. Restart Thunderbird.