I received an email on Thunderbird with an URL for a Flicker Photo Album. But it will not open. I forwarded it to my other computer also with Thunderbird and it opened straight away.
I can not find the reason why it will not open on the first computer.
Does anybody know the answer to this problem ?

The problem was so simple to fix,somebody ( ME ) forgot to make the web browser default, in this case FireFox. I did that and all problems are fixed.

Thanks for the info. Good to have! Glad you figured it out.