 - properly replace button on Fx add-on pages with versions for multiple OSes  - properly replace button on Fx preliminary add-on pages
 - properly replace button on Fx add-on pages with versions for multiple OSes
 - properly replace button on Fx preliminary add-on pages

lemon-juice/AMO-Browsing-for-SeaMonkey,lemon-juice/AMO-Browsing-for-SeaMonkey,lemon-juice/AMO-Browsing-for-SeaMonkey