My Gmail Font size keeps shrinking
I use firefox, window 7 64 bit home premium. Relatively new Dell 14R laptop.
For some reason, as I must have brushed across a key or touchpad, the font size for gmail keeps getting smaller. I can no longer read it, it's so small. All other web pages display fine. If I check firefox tools, options, the font size for all is 20 point (seems strange - but it displays fine). I don't want to enlarge everything. How can I change font size for gmail. I can't find a way within gmail.
I also wonder what I'm doing or brushing against that keeps shrinking it.