If you compose your e-mails with HTML in Mozilla Thunderbird, Netscape or Mozilla, there is a convenient way to insert a link. Here's how.
How do I add a link in Thunderbird?
To insert a link into an email in Mozilla Thunderbird or Netscape, follow these steps:
When composing a message, press Ctrl-K (Windows, Linux) or Command-K (Mac).
Under Enter the text to display for the link, enter the text you want to use as the clickable link.