I just had a situation, where I had changed my default browser (from Maxthon to Opera), and then found clicking on web links within an email would result in Maxthon displaying the web page.

I tried a PC restart, changing file type associations… but nothing would work.

I eventually found an interesting utility called DefaultBrowser, which fixed the problem quickly and easily.

I can’t be sure if its a problem with Opera, Thunderbird (email), or Maxthon… but it seems that changing your default browser isn’t as simple as it should be.