MAC OS Standalone Extension

Hi,
I added the Zotero standalone extension for Safari about a month ago. It's been working till about a few days ago. I can still access the standalone program but I don't see the zotero icon in my address bar as usual. I'm not sure what happened. I also don't seem to have any extensions when I check under Safari's Tool/Preferences menu. Unsure how to restore things. I'm not sure if this relates to the also sudden inability of me to access journal articles directly through my institution's wireless network ( a payment option for accessing the article pops up instead of the usual just showing the article). Help would be appreciated!

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