Change theme font in thunderbird email-client
In your home-directory “.thunderbird”, go to the thunderbird profile-folder (in my case the folder “……..default-release” ) and create in that folder another folder named chrome.
In this folder, create a text file named userChrome.css
In that file place the following code:
/* import a font of your choise: */ @import url("https://fonts.googleapis.com/css2?family=Special+Elite&display=swap"); /* * Do not remove the @namespace line -- it's required for correct functioning */ @namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* set default namespace to XUL */ { font-size: 9pt !important; font-family: 'Special Elite', cursive !important; }