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How do I change the default browser For Thunderbird on an iMac?

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My iMac is set to use Opera as the browser for Thunderbird emails. I want to change it to Chrome. How do I change the browser? thanks for any help!

My iMac is set to use Opera as the browser for Thunderbird emails. I want to change it to Chrome. How do I change the browser? thanks for any help!

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Thunderbird uses the default browser that you have set in your operating system.