Hello there We have read you’re message. We try to help you. Does the entry field turn black? Is the field still usable after typing into the field? What system do you guys use?window system or Mac system? Laptop or desktop? Mobile? And what search field are you using? Google? The search field from Thunderbird? Are there Some messages. Error Messages? Any crash reports? Send us some pictures? Please. https://mozillathunderbirdhelp.blogspot.com/2020/07/how-to-fix-mozilla-thunderbird-black.html https://www.thunderbird.net/en-US/thunderbird/releases/ https://support.mozilla.org/en-US/kb/safe-mode-thunderbird To check if your problem goes away restart in safe modus to see if the problem is still there?then it could be some other software on your pc. Tho try to startup in Safe modus first please. Greetings Firefox volunteer.