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How to "Permanently" save custom font changes in my computer

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My Version of Thunderbird is: 128.1.0esr (64-bit) on a Windows 11 computer. After recent automatic update, the Inbox list font or sizes were changed. I have managed to isolate the style and edited it to my liking. But I do not know how to save it or make it permanent on my computer. My Changes are as follows( Copied from Developer Toolbar):


Screen shot of changes is attached below:

My Version of Thunderbird is: 128.1.0esr (64-bit) on a Windows 11 computer. After recent automatic update, the Inbox list font or sizes were changed. I have managed to isolate the style and edited it to my liking. But I do not know how to save it or make it permanent on my computer. My Changes are as follows( Copied from Developer Toolbar): -------- Screen shot of changes is attached below:
Attached screenshots

Modified by Hammad Rauf

Chosen solution

Have you created a userChrome.css file? That is the usual way to make permanent changes to the interface. For the card height (density) and font size, one option for the css is:

/* message list card height & font */
.thread-card-container{
     height: 60px !important;
     font-size: 18px !important;
}

Additional card css and instructions:

https://support.mozilla.org/en-US/questions/1447610

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My Version of Thunderbird is: 128.1.0esr (64-bit) on a Windows 11 computer.

Helpful?

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My Version of Thunderbird is: 128.1.0esr (64-bit) on a Windows 11 computer.

Modified by Hammad Rauf

Helpful?

more options

My Version of Thunderbird is: 128.1.0esr (64-bit) on a Windows 11 computer.

Modified by Hammad Rauf

Helpful?

more options

Chosen Solution

Have you created a userChrome.css file? That is the usual way to make permanent changes to the interface. For the card height (density) and font size, one option for the css is:

/* message list card height & font */
.thread-card-container{
     height: 60px !important;
     font-size: 18px !important;
}

Additional card css and instructions:

https://support.mozilla.org/en-US/questions/1447610

Helpful?

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Thank you @sfhowes. I was able to fix it to my liking following the video from your link plus enabling legacy support as follows:

Click ≡ > Settings > General Scroll down to the bottom and click Config Editor… Enter "toolkit.legacyUserProfileCustomizations.stylesheets" and, its value should be set to "True"

Helpful?

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