You can style almost every part of the interface with userChrome.css files. As an example, this code sets the background color of the Folder and Threads Panes to light grey:

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

#folderTree,
#threadTree
{
  background-color: #D3D3D3 !important;
  color: black !important;
}

Close TB and create a folder named chrome in the profile folder, create a new text file in chrome and save it as userChrome.css with the file type All files *.*, copy the above code into the css file, Save, restart TB.

sfhowes said

You can style almost every part of the interface with userChrome.css files. As an example, this code sets the background color of the Folder and Threads Panes to light grey:

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

#folderTree,
#threadTree
{
  background-color: #D3D3D3 !important;
  color: black !important;
}

Close TB and create a folder named chrome in the profile folder, create a new text file in chrome and save it as userChrome.css with the file type All files *.*, copy the above code into the css file, Save, restart TB.

Thank you for your help sfhowes, very much appreciated. The only issue with the folder tree is that every other folder in the tree is on a white background rather than grey. Can that be changed so that the entire folder tree background is all one colour? A light/pastel brown or green would be nice ;-)

Apologies sfhowes please ignore my last post to you, my bad. After I went and selected either of the other 2 TB default theme options, your coding works perfectly. The 'OS System' colour scheme option is the only one of those 3 options that produces the alternate white/colour lines behind the folder tree background. So all is good, thanks to you. Kudos to an awesome 'Mozillian Magician' ;-)

Mozilla "killed" full themes. Thunderbird really had no choice to follow suit. So long term there is using CSS as chist1 has said or just using the default themes.

Personally I think the CSS option will become much more popular than it was in the past.

Matt said

Mozilla "killed" full themes. Thunderbird really had no choice to follow suit. So long term there is using CSS as chist1 has said or just using the default themes. Personally I think the CSS option will become much more popular than it was in the past.

Thank You Matt for your input. Hopefully I can successfully find my way around TB's 'config' (Dragons Cave!) data in order to identify the 'Menu Bar', 'Mail Tool Bar' and 'Status Bar' background colours, so that I can match the colours there to give some 'balance to the overall modified theme. ;-)

Here is some css code to add. Change the colors as desired.

/* Mail Toolbar */

#mail-bar3
{ background-color: cyan !important; }

/* Status Bar */

statusbarpanel {
background-color: #5E5E61 !important;
color: #F3F3F5 !important;
}

Many thanks for your help and guidance sfhowes very much appreciated. I have had loads of fun, using your coding tips below, to make many colour combinations, but..... Various shades of green are proving to be a favourite of mine, probably because there is not a lot of that around my part of Australia at this moment in time.

sfhowes said

Here is some css code to add. Change the colors as desired.

/* Mail Toolbar */

#mail-bar3
{ background-color: cyan !important; }

/* Status Bar */

statusbarpanel {
background-color: #5E5E61 !important;
color: #F3F3F5 !important;
}