Google Chrome
From Richard's Wiki
Change Minimum Font Size in Google Chrome
Preferences are stored in preferences file. Path in Windows 7 is like:
C:\Users\<<User Name>>\AppData\Local\Google\Chrome\User Data\Default\Preferences
Add the following to the file (make sure Chrome isn't running, it will overwrite your changes when it exits):
"webkit": { "webprefs": { "default_fixed_font_size": 20, "default_font_size": 20, "fixed_font_family": "Bitstream Vera Sans Mono", "inspector_settings": "lastActivePanel:string:console\n", "minimum_font_size": 20, "minimum_logical_font_siz": 20, "standard_font_is_serif": false, "text_areas_are_resizable": true } },