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Why has Thunderbird started prompting for Caldav at startup?

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rousea
rousea

For the past few days when I open Thunderbird I get a message "https://caldav.one.com is requesting your username and password." (see attachment). I've never signed up for Caldav so I don't have a username or password. If I hit "Cancel" it proceeds as normal. If I enter my email address and log-in password it also proceeds as normal. In either case I have to go through the same process every time I open Thunderbird.

For the past few days when I open Thunderbird I get a message "https://caldav.one.com is requesting your username and password." (see attachment). I've never signed up for Caldav so I don't have a username or password. If I hit "Cancel" it proceeds as normal. If I enter my email address and log-in password it also proceeds as normal. In either case I have to go through the same process every time I open Thunderbird.
Attached screenshots

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