I recently installed Twirl, an Adobe Air application that helps to keep you up to date with Twitter on my Windows Vista computer. The application is great, however, there was one thing that annoyed me - whenever I clicked on a link, it would always open in Internext Explorer - even though Mozilla Firefox is my default browser.

After googling around for a while, I managed to find the below solution on twhirl’s blog which seemed to do the trick for me:

Go to Start > Default Programs > Set Program Access and Computer Defaults
Expand Custom, select the radio button next to the application you want to set as the system-wide default browser (there will be a few options - such as IE, Safari, Mozilla) and apply the setting.

Hopefully all your links should now open in Firefox and not in IE.

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