bookmark to add to library without plug in

Hello!
On my employers PC I cannot install Zotero as plug in. But obviously I can access my library via my zotero account. I believe to remember that one could set a kind of bookmark in Firefox so that one can easily add media to the library also from computers that do not have the plug-in, but I failed to find that again. Does it still exisit?
Very grateful for any help!
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