no Zotero icon on Safari

Hi,
I downloaded Zotero a couple months ago and it seems to have been working fine when I log in on the website. I can also access my library from Word if the app is running in the background. I have added resources in my library manually; however, I heard I was supposed to simply click on a button when a resource is open on my tab to store it in my Zotero library. This is something I can't seem to do as there are no buttons or icons supposedly on Safari itself, nor on Firefox. What am I doing wrong? How can I make that icon appear so all I have to do is click on it to store an article in my Zotero library? Thank you.
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