You might be seeing Open Sans. If you right-click the text you like, choose Inspect Element (<u>Q</u>), then (if necessary) click Style in the lower right corner to open the Style pane, you can see what fonts are assigned to that element. Firefox will use the first available font. There also is an add-on which will tell you the ''actual'' font used in a selection of text in a page. This is helpful when the font-face style rule refers to platform-specific fonts or downloadable fonts and you aren't sure which one is relevant. See: https://addons.mozilla.org/en-US/firefox/addon/fontinfo/