>>>I am looking at UT from FireFox. I can increase the fonts of the FireFox (by going to View -> Zoom). But the text on the toolsbar above (where it says, Search, Calendar, Member, Folder, etc) is very small. The same is a problem with the command Send, Preview, etc; too small. Is there a setting in UT that would allow me to increase these fonts?
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>>Mouse over the top bar, press and hold the Ctrl key, roll the mouse wheel up or down to change font size.
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>This changes the font of the text but not the font of the text in command buttons.

Because it's not text, these are images containing text. You can add ImageZoom from http://imagezoom.yellowgorilla.net/, but you'd still have to enlarge each.

Hmmm, wait, when I hover over the toolbar and move the mouse wheel, the sizes of all the images in it change... in Firefox 17. So that doesn't require ImageZoom, which is for individual images (and uses rightclick+wheel).