Is it yet possible to change all global font sizes in thunderbird?

Question

I see there are several posts about the base font sizes in thunderbird but have you actually solved this yet please?

Answer 1

These are the Options available to you which can increase the font size of '''everything''' in Thunderbird - Folder pane - email list etc. It is up to you which you choose to use.
'''1. Increase screen resolution'''
You have not told us what screen resolution you are using. This will effect everything you see on your desktop and all windows including Thunderbird. So if you are having an issue with the idea of using addon or creating a userChrome.css file then try this first.
Control Panel > Personalization > Display Settings A high Resolution will decrease the overall size of everything. If you are finding everything on your computer including everything in Thunderbird is too small, then lower the Resolution setting to increase the over all appearance of size. It is operated using a slide bar. then click on Apply and then OK when happy with result.
'''2. Use an Addon: '''
addon will only effect Thunderbird and not other programs nor desktop.
* https://addons.mozilla.org/en-us/thunderbird/addon/theme-font-size-changer/
download the addon to your computer. then install the addon following this information:
* https://support.mozilla.org/en-US/kb/add-ons-and-extensions-faq#w_how-do-i-install-an-add-on
'''3. create css file This only effects Thunderbird.'''
This may seem a little daunting, but it is simple. It requires you to be able to follow instructions, create folders, copy paste and save files. You do not need to actually write code.
Make Hidden files and folder visible:
* http://kb.mozillazine.org/Show_hidden_files_and_folders
In Thunderbird:
* Help > Troubleshooting Information
* click on 'show folder' button
* a new window opens showing your Profile folder.
* '''Close Thunderbird now - this is important.'''
Create new folder and call it '''chrome''' note the spelling - use a lower case 'c' It should be in the same place as the 'Mail' folder.
open Notepad:
usually located under All Programs > accessories > Notepad
Copy all the text between lines below and paste it into the Notepad document.
<pre>
* Do not remove the @namespace line -- it's required for correct functioning
@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
*Make all the default font sizes eg:14 px:
* { font-size: '''14px''' !important; }
</pre>
If this proves to be too small you can edit the 14px to say 16px etc
Save the document as filename '''userChrome.css''' in the '''chrome''' folder. Note the spelling all lower case except for the 'C'.
Restart Thunderbird.