''<p>CarlW [[#question-1550665|说]]</p>'' <blockquote>The chat feature is useless to me. Could you please remove or disable the button shown in the image? Thank you. </blockquote> I am using the latest version of Thunderbird (Windows 10 145.0 64-bit).

#chatButton{display: none}

Add this to userChrome.css: <pre>#chatButton{display: none}</pre> Help/Troubleshooting Info, Profile Folder, Open Folder, 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. Double-click ''toolkit.legacyUserProfileCustomizations.stylesheets'' to true in Settings/General/Config. editor, restart TB. [https://www.userchrome.org/download-userchrome-css.html Online css generator] [https://www.userchrome.org/how-create-userchrome-css.html video: How to create a css file (Firefox or TB)]