Thanks for your reply, Kevin.
I'm not what you would call computer literate, but I get the gist of what you say. I know about browser plugins, but are there any other kinds? Firefox, my default browser, tells me I have two plugins, a video codec by Cisco and a Widevine content decryption module by Google. Whether either is the culprit I couldn't say. And in any case I don't feel confident enough to go rummaging around in that area. Ho hum, what to do now?
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