Sorry, outside of developer mode, Chrome extensions can only be installed from the Chrome Web Store, so if google.com is blocked for you you won't be able to install any extension. (You can click to install it from the Zotero download page, but it still comes from Google.)
Sorry, outside of developer mode, Chrome extensions can only be installed from the Chrome Web Store, so if google.com is blocked for you you won't be able to install any extension. (You can click to install it from the Zotero download page, but it still comes from Google.)
You could consider using Firefox instead.