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Thunderbird strange behaviour when clicking on links in emails

Making moves

I use Firefox and since ver 115 of Thunderbird If Firefox is closed and I click a link in an email in Thunderbird Firefox opens with the link in a new tab. ( Firefox is always closed with multiple tabs) This works as I expect and has always worked like that. However, since 115 if Firefox is already open when I click a link in Thunderbird it is opened in a new window not as a Tab in the existing window. This is very annoying. How do I fix that or is it as designed?