VERY NICE Rated 5 out of 5 stars

Love this one. My aging eyes were having trouble seeing the toolbar. Now it's nice and big and clean! Thanks so much.

Nice and simple, works with other buttons too. Rated 5 out of 5 stars

It works great, makes all the toolbar buttons bigger, even 3rd party ones, without taking up hardly any more space, and without changing the button images. And they still look great too - some even look better.......:^)

It even works with the following add-ons I use regularly:
Toolbar Buttons 1.0
Walnut for Thunderbird 2.0.12

Never had a problem with it. The ONLY thing I'd like is if it could be made to work on Firefox as well, that'd REALLY be great!......:^)

Thanks, and Merry Christmass!

It Works! Rated 5 out of 5 stars

After an almost immediate, polite and informative response from the developer, I did the following: disabled Theme Font and Size Changer, installed Bigger Toolbar Buttons, works like a charm, re-installed Theme Font and Size Changer, everybody's happy now. Haven't tried it on the Linux Mint side of the computer, but I expect no problems.

Now a request: there are still a bunch of tiny icons to click on, such as the x on the tabs, which do not change size. Either its my set up, or Thunderbird's folks haven't looked at the needs of large high res displays. It could very well be that I need to change something, any thoughts appreciated.

This user has a previous review of this add-on.

Large Theme

Well, what's really needed is a large theme for Thunderbird. It's something that I've always wanted to make but have never had the time to do.
I have poor eyesight plus my screen resolution is 1920x1200 so I've had to customize a lot of things for myself including using my own large toolbar buttons, close buttons, icons and other things.

If you use Stylish, the following may be helpful. It isn't a perfect solution, but it may help and you could use your own image for the close button and make it whatever size that you'd like, or just add a background color or border for better visibility of the close button.

.tab-close-button > .toolbarbutton-icon{
min-width:30px!important;
min-height: 30px!important;

}