How to increase font size in Thunderbird 68

Guys, after refusing to use TB68 for months, I was finally forced to use it, because some recent system upgrade broke my old TB60.
Now I am looking at a mail client window with ridiculously tiny fonts, probably 8 pt …
I tried to increase the font size in the TB settings, but regardless of the font size I set there, all fonts stay tiny.
In TB 60, I used an addon called theme and font size changer to increase the font size, but that addon was killed by progress and is not available fot TB 68 anymore.
Can someone explain to me how to increase the font size in TB 68?

Preferences->Display->Fonts & Colors changes the font in the message window and settings but I am guessing that is not what you want.

I believe the interface uses your system fonts. It you want them to be bigger, you can use the config editor and change: font.size.systemFontScale

It seems to take a restart of Thunderbird for it to take effect.

EDIT: One way to get to about:config is Preferences->Advanced->Config Editor

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I have had the same problem and used following workaround:

  1. End Thunderbird.
  2. Create a folder “chrome” in your thunderbird user profile folder if it does not exist.
  3. Create a file called userChrome.css if it does not exist.
  4. Enter following data into the file:
* {
font-family: Verdana, Arial, Sans Serif !important;
font-weight: normal !important;
font-size: 12px !important;

You can change font size and used font as you want.

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I always faced this issue too but i don’t use tb that much so i never bothered finding a solution.
@dalto suggestion doesn’t work but @marteng69 worked fine here.
Thank you :slight_smile:

That worked.