Safari blocked plug-in
How do I unblock a blocked plug in in Safari web site?
iMac Line (2012 and Later)
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macOS Big Sur 11
Plug-ins
“Learn more
Safari no longer supports most web plug-ins. To load webpages more quickly, save energy, and strengthen security, Safari is optimized for content that uses the HTML5 web standard, which doesn't require a plug-in. To enhance and customize your browsing experience, use Safari extensions instead of web plug-ins.”
https://support.apple.com/en-us/HT203051
Is this about signing into a financial website?