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Where is the userChrome.css? and how to change fonts size of message pane for mac 91.3.2.

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Where is the userChrome.css? and how to change fonts size of message pane for mac 91.3.2.

cannot understood the debug mode.

Where is the userChrome.css? and how to change fonts size of message pane for mac 91.3.2. cannot understood the debug mode.

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By 'message pane', do you mean the content of messages in the Message Pane (F8), or the list of messages, Subject, From, Date etc. in the Threads Pane? For the latter, a typical css contains this code:

#threadTree > treechildren {
  font-size: 12pt !important;
  background-color: lightgrey !important;
  color: navy !important;
}

Help/More Troubleshooting, Profile Folder, Show in Finder, close TB, create a new folder named chrome, create a new document in chrome with a text editor, name it userChrome.css, Save as type: All files *.*, copy in the above code, change the colors and numbers as desired. Double-click toolkit.legacyUserProfileCustomizations.stylesheets to true in Preferences/General/Config. editor, restart TB.