no "add to zotero" icon in address bar for many sites

I'm new to zotero. I immediately went to some of my research sites to load into the database, but there was no "add to zotero" icon in a number of the address bars. Am I doing something wrong? I'm on a Mac.
  • Just because you can see bibligraphic data on a website doesn't always mean that it's in a Zotero friendly format.

    Check out these links:
    No Icon
    Known Translators

    If the sites you are having problems with have known translators, or don't appear as partially or not supported, please post them here.

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