This seemed to happen out of the blue. I have been using Opera for years.
I can't find anywhere in Gmail to change the default font that is used in Opera.
Ubuntu is Version 11
Opera is version 11.6
In Firefox the font is normal size.
I have tried playing around with both all the browser setting I can find plus Ubuntu system settings (I had seen some mentions of Opera using the system default font sometimes) but no success so far.
Really bumming as I have been using Opera for two years and if I can't resolve it I will not be able to use it.
I can switch to Firefox but I don't want to.