why would you like to do that?

My 80 year old eyes need a larger font size to aid in viewing.

normally control+ that's the control button or ctrl and the plus button increase the size of text, if you you windows there should also be a magnifier built in to the windows ease of use options. Do you wear glasses?

That just controls the message text size but, not the title size. I knew that but was hoping someone was able to tell me how to increase the title size if that is possible . Thanks for the response and I do wear glasses.

there is someone here that knows a lot about mozilla software, i hope it will be possible for you. Do you have stronger glasses?

cor-el knows a lot about mozilla software. Have you tried contacting him?

This was my first attempt, not sure I want to continue was hoping that someone had a fix. Don't know how to contact a specific person Thanks

Install this add-on https://addons.mozilla.org/en-us/thunderbird/addon/theme-font-size-changer/

Instruction to install an add-on http://chrisramsden.vfast.co.uk/3_How_to_install_Add-ons_in_Thunderbird.html

Thanks.... when or if brave will try.

No need to be brave.While I linkedto the add-on in a browser, Thunderbird can do most if not all the heavy lifting.

Just use the menu on the right of your Thunderbird toolbar to select add-ons. Type the name of the add-on in the box on the right of the screen and press enter (just typing theme is enough)

When the list appears click the install button beside the add-on name in the list. Your done after a restart of Thunderbird.

Thanks for all your help, will try latter and will post if this meets my needs. Thanks again for taking the time to give an old man so assistance.

Thanks.... after some playing by the old man, got it to work to my satisfaction and it solved my problem. Thanks again for your time and effort.