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How do I set default browser in Thunderbird

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Currently when I try to access say "update Preferences" on an incoming email through Thunderbird , no browser facility pops up. Hence I am unable to access "F1" when trying to get Help contents. Can anyone help please?

Currently when I try to access say "update Preferences" on an incoming email through Thunderbird , no browser facility pops up. Hence I am unable to access "F1" when trying to get Help contents. Can anyone help please?

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Start > Settings > Control Panel > Default Programs Have you set your computer to have a default browser? Have you set the program access and computer defaults?

Have you checked in Firefox to see if it your default broswer? Tools > Options >General

Information in support help pages: https://support.mozilla.org/en-US/kb/hyperlinks-in-messages-not-working