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Change fonts on Mac computer

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I need to change all the font sizes of my Thunderbird on Mac, menu's fonts included. I tried to modify the userChrome.css file but nothing change. There is anyone can help me? Thanks. Here what I done for TB version 76.5 (64 bit):

name@MyMac chrome % pwd /Users/name/Library/Thunderbird/Profiles/m2vx3jrx.default-release/chrome

name@MyMac chrome % ls -la userChrome.css -rwxr-xr-x@ 1 name staff 170 2 Dic 11:04 userChrome.css

name@MyMac chrome % cat userChrome.css /*

  • Make all the default font sizes 20 pt:
  • /

@namespace url("");

  • {

font-size: 16pt !important; }

name@MyMac chrome %

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