
I learned that back in the DOS days that when you get “upgrades” they usually aren’t, so give it a couple of weeks (with iOS on my phone, I wait a month or 6 weeks because Apple’s worse than Micro$oft about bugs). Hit Ctrl+Alt+Shift+I or open 'Tools > WebDeveloper > Browser Toolbox'.įorce popups to stay open for inspection:Ĭlick on 'Customize Tools and get help button' (= button with three dots) and select 'Disable popup auto-hide'.I never allow automatic updates of ANYTHING. * "./css/buttons/ctb_on_main_toolbars.css" /**/Ĭode between /* and */ won't be used by Thunderbird unless there are other /* or */ in-between.

If "classic button appearance for navigation toolbar buttons" should be disabled, the corresponding line has to look like this: If "classic button appearance for navigation toolbar buttons" should be enabled, the corresponding line has to look like "./css/buttons/ctb_on_main_toolbars.css" /**/ Restart Thunderbird after every modification for changes to take effect. All main "features" can be enabled and disabled there.Įdit userChrome.css and userContent.css with any text editor ( Notepad++ recommended on Windows) and enable or disable any feature you like by modifying, removing or outcommenting available strings. The userChrome.css and userContent.css files works like an options\configurations file. \chrome\userContent.css How to use custom user styles? Copy userChrome.css, userContent.css and \config\, \css\, \images\ folders into \chrome\ folder. \Users\ USERNAME \Library\Application\Support\Thunderbird\Profiles\Ģ. ~\Library\Application Support\Thunderbird\Profiles\ PROFILE FOLDER NAME \ ~\Library\Thunderbird\Profiles\ PROFILE FOLDER NAME \ or home/ username /.thunderbird/ profile folder name / Alternatively open %APPDATA%\Thunderbird\Profiles\ from explorers location bar. Hidden files must be visible to see AppData folder. > true Where to find Thunderbird profile folder? The correct location for user styles.Ĭ:\Users\ USERNAME \AppData\Roaming\Thunderbird\Profiles\ PROFILE FOLDER NAME \ Settings/Options > Advanced > General > Config Editor.


