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Fix Font Scaling and Density Issue on Thunderbird 115 Upgrade

If you have recently upgraded to Thunderbird 115 “Supernova” and noticed a smaller font size or a presentation that feels too compact, there might be an easy solution. You should be able to simply change the font from the app menu to achieve your ideal font setting by clicking the +/- to change the font size globally (see below).

As the GIF above illustrates, here’s how to do it:

If for some reason that does not fix your font resizing problem, then you may have hit a known issue about the font size going back to a smaller size due to some unsupported properties being adjusted either directly or via an add-on.

You can find more detailed info on fixing these technical issues in our support article.

3 responses

Bruno G. wrote on

My issue was with the line spacing of the `Compact` density, not the font size.
Using the `toolkit.legacyUserProfileCustomizations.stylesheets = true` setting, with this in my `userChrome.css` file (found somewhere else on the web):
height: 20px !important;
.container {
line-height: 20px !important;
I was able to use the `Compact` density while having some space between the lines to improve readability.

eleanor williams wrote on

I still can’t see where I can tag emails

Jason Evangelho wrote on

Have your tried right-clicking on an email and selecting “Tag?”

Comments are closed.