I followed the instructions to set Gmail as my default email client by inserting this:
In address bar of same tab, type/paste this & hit enter:
javascript:navigator.registerProtocolHandler("mailto", "https://mail.google.com/mail/?extsrc=mailto&url=%s", "Gmail");
How do I change this to Thunderbird? I don't want Gmail to open mailto links in Chrome.
Best Answer
The mailto function opens the primary email client. If you want to use Gmail as your client there is no way to open mailto in Thunderbird.
If you want to move from Gmail to Thunderbird you should try to set it through the Thunderbird preferences. There should be a button like 'check if Thunderbird is default email client'.
As an alternative follow Ali's description.