If you are referring to content within the Add-ons Manager ("Ctrl+Shift+A") , the add-on lists, which are now displayed within a tab, then use "Ctrl+0" (zero to restore normal size), like on a web page. "Ctrl++" to increase size (zoom in), "Ctrl+-" to decrease size (zoom out). http://kb.mozillazine.org/Zoom_text_of_web_pages If that is what you mean then every use of the word icon should have been plural (words and icons), and the focus would be on the content -- not the tab itself. <br><small>Please mark "Solved" one answer that will best help others with a similar problem -- hope this was it.</small>