Lately I’ve been playing with Opera. Despite my love for Firefox I found that I really like it, so I’ve started using it as my main browser on a daily basis.
I don’t use an integrated desktop environment (right now my desktop is a mix of Fluxbox, Xfce and LXDE, among other things), so I don’t have a centralized graphical tool where I can set the default browser.
In particular, finding out how to set the default browser used by Thunderbird when I click on the http links in my emails was kinda tricky, but thanks to mozillaZine I did it. Here’s how:
- select Preferences from the Edit menu;
- go to the Advanced tab and push the Config Editor button;
- swear that you’ll be careful! 😉
- search for the following entries and set them to true by double-clicking them: network.protocol-handler.warn-external.http, network.protocol-handler.warn-external.https, network.protocol-handler.warn-external.ftp;
- that’s it! The next time you’ll click on an http link in an email you’ll see a popup window where you’ll be able to set your default browser.

Change thunderbird default web browser | Jinha's Blog
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Thank you so much. Finally got this to work.
Thanks! This is the FIRST time that’s actually worked for me!
Great ! It works for me.
Thank you so much!
Why is something simple like this made so difficult? Clearly explained. Thanks for posting!