Blocked plug ins

Try suggestions given here.

https://support.apple.com/guide/safari/disable-block-a-safari-plug-sfri27594/mac

https://support.apple.com/guide/safari/websites-ibrwe2159f50/mac

https://support.apple.com/guide/safari/customize-settings-per-website-ibrw7f78f7fe/mac

It is hard to find relevant support article for Safari 10.10.5.

Try suggestions given here.

https://support.apple.com/guide/safari/if-a-plug-in-is-missing-in-safari-on-mac-ibrw1036/11.0/mac/10.13

Safari >Preferences > Security

Checkmark Enable JavaScript and Allow plug-ins

Click Plug-in settings.

Select the Plug-in

Select "On" when visiting other websites.

I am not sure what you are asking but I think it is the same problem I had with safari extensions:

I have posted a solution here!

https://discussions.apple.com/thread/251272809