No Zotero icons in browser window since Firefox 20 upgrade
Mac OS 10.6.8. Firefox automatically upgraded to 20.0, and Zotero upgraded to 18.104.22.168. Now I no longer have Zotero icons in my browser window. Is Zotero 4.0 compatible with Mac OS 10.6.8? I don't want to attempt an upgrade until I'm sure of compatibility. Easy fix please, I'm under pressure to finish my thesis!