I read a few news aggregation sites using Firefox browser. Sometimes the sites are easy to read and appear formatted for mobile devices, with all stories running in one column, and at other times the print is so tiny I cannot read it, and have to scroll left to right to read while zoomed in. It appears there is some way to change the way websites appear or their format, and I do it by accident on occasion, but I don't know how to control it. Any insight would be appreciated.