>I do view UT from FF in 100% browser view (unless I misunderstand what it means). And I can increase all fonts of your site (text) but not the fonts on the toolbars.

As soon as you change the default view of the browser, which is suppose to be 100%, this is normal. As for the toolbar, this is an image. So, the text is part of the image. It won't grow as you adjust your browser.