Is There a Computer Guru in the House?

I did something to my computer and I'm not sure what.

I got a new wireless mouse (long story) and got it set up.  Works great.... so I go to my blog, do something (not sure what) but I rolled the wheel and the layout, font, photos, everything... even the Blogger stuff on the page... got smaller.

I checked my blog at work today and everything is "normal" size.  When I visit other blogs OR go to Blogger pages....  New Post, Stats, etc.....   everything is the right size.

I tried searching for info on Windows 7 (OS), Firefox Mozilla (browser), and generic computer terms....  I've right-clicked/left-clicked and rolled the wheel thing to no avail.  For $38, I can get an online expert to tell me how to fix it.... but I just filled up my car.....

I know it's not the end of the world but I would like to have the font & photos to be normal size.

Anyone have any ideas?

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Y'all are just THE BEST!  Not only is my blog page back to normal size.... I learned a bunch of new computer tricks!