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I'm actually not sure if its my default browser for ubunutu that I need to change or just for Thunderbird. I wasn't aware that I could have a default browser for ubuntu but I use firefox and thunderbird opens everything in chrome.

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up vote 3 down vote accepted

Go to System -> Preferences -> Preferred Applications

Got this from here -

share|improve this answer GAlternatives lets you set default browser, this solved the problem for me, some apps still opened firefox instead of chromium after setting the prefered browser via ubuntu menu

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