- click settings>general and scrollodown to config editor - search for toolkit.legacyUserProfileCustomizations.stylesheets and change to true - then you need a folder named 'chrome' in profile, and a userChrome.css file in the folder (with content shown below). - exit and restart TB and it should work, although I've sometimes found I have to restart TB twice to see changes in userChrome.css - Below is content for userChrome.css

/*  #######    */
@namespace html url("http://www.w3.org/1999/xhtml");

#toolbar-menubar {
  order: 1;             
}

unified-toolbar {
  order: 2;             
}

#tabs-toolbar {
  order: 3;              
}

Note: There were technical reasons for this, resulting in cleaner, simpler, code, so it was no accident. This fix does the job, though.

Thanks for your reply and help, David !

So I checked AppData, both Local and Roaming but neither Thunderbird Profile as a Chrome folder. Oddly, both do have Profiles but if I need to make a new 'Chrome' folder, not sure which one.

Hope you or someone can offer a bit more direction, Thanks!  :D

the profile is in appdata\roaming. easiest way to get there is to click help>troubleshootinginformation, scroll down to 'profile folder' and click 'open folder'. That drops you right in the profile. You need to create the chrome folder - chrome, not Chrome. And in that folder, create text file of userChrome.css

Thanks again for all your help, it did work! :D

An addendum, at least for me it needed to go in the individual profiles, which are in the Profile folder. I.e. \default-release*

Edit: I'm still shocked by your mention, these changes seem intentional.

You're welcome. Yes, the change was intentional and there is a page somewhere with all the explanations about it. Fortunately, this corrects it for our use.

- click settings>general and scrollodown to config editor - search for toolkit.legacyUserProfileCustomizations.stylesheets and change to true - then you need a folder named 'chrome' in profile, and a userChrome.css file in the folder (with content shown below). - exit and restart TB and it should work, although I've sometimes found I have to restart TB twice to see changes in userChrome.css - Below is content for userChrome.css

/*  #######    */
@namespace html url("http://www.w3.org/1999/xhtml");

#toolbar-menubar {
  order: 1;             
}

unified-toolbar {
  order: 2;             
}

#tabs-toolbar {
  order: 3;              
}

Note: There were technical reasons for this, resulting in cleaner, simpler, code, so it was no accident. This fix does the job, though.

Thank you! I'm a heavy user of Firefox and Thunderbird for more than 15 years. It's a shame that Mozilla products - once the cream of customization, now fall behind competitors. Hopefully they will restore to previous heights one day...