The other day Firefox alerted me that there was a newer version of the SiteAdvisor add-on, version 28.0, so I downloaded it and restarted the browser. However, Firefox said it was version 26.6. Today I received the notice again that SiteAdvisor was updated to version 28.0, so I downloaded it and installed it. It now says that it is version 28.0, but under the Add-ons menu on Firefox, the Options button is grayed-out so that I can't click on it. I am able to change the options by clicking on the SiteAdvisor button on the bottom of the Firefox browser, however.
Is version 28.0 indeed the most recent version of the add-on for Firefox? I can't seem to find this answer anywhere.