Enter mail.uifontsize and if it has been changed you will see a reset button which will look like a counter clockwise arrow button.

To reset mail.uifontsize directly to the supported default value:

Enter and if it has been changed you will see a reset button which will look like a counter clockwise arrow button.

Scroll down to the bottom and click Config Editor….

To reset directly to the supported default value:

Other reasons, which require investigation.

CSS overrides in userChrome.css (which are unsupported).

Something changed an unsupported preference called mail.uifontsize.

Something changed an unsupported preference called.

As a result, we see rare unexpected reports of zoom not working, or too large or too small displays or fonts which require your adjustment or investigation. In order to provide a better, more easily configurable user experience, Thunderbird 115 has taken must stronger control of UI sizing. Why are the fonts still too large (or too small) after I changed the density and font size? Click + to increase the size of the fonts or click - to decrease the size of the fonts.

Change the font size to suit your needs: Click ≡ > Font Size.

Then click (for 'Relaxed') to increase the size of UI elements in Thunderbird or click (for 'Compact') to decrease the size.

Change the density to suit your taste: Click ≡ > Density.

Why are Thunderbird 115’s fonts so large? So small?įor most people, this issue can be solved using the Thunderbird Application menu, ≡ as follows :

(all releases, including details on the latest minor releases).

Getting Started with the Thunderbird main window (Supernova and newer).

Where can I find more information on changes and new features in Thunderbird 115 Supernova?

6 Why are my Thunderbird customizations broken in 115?.

5.2 We recommend Add-ons and Themes to customize your colors.

5.1 Why does Firefox follow the OS colors?.

5 Why doesn’t Thunderbird follow the operating system accent colors, especially on Linux?.4.4 Step 4: Customize The Message Header.4 How do I get the Thunderbird 115 “Supernova” Look?.

3 Why are the fonts still too large (or too small) after I changed the density and font size?.2 Why are Thunderbird 115’s fonts so large? So small?.1 Where can I find more information on changes and new features in Thunderbird 115 Supernova?.

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