If you're the kind of person who likes to have a colorful signature in your e-mail messages, this program is for you.
WiseStamp is a Firefox add-on that lets you add a fully customizable e-mail signature to all your outgoing messages. The good thing about it is that it's compatible with the most popular webmail services on the web: Gmail, Hotmail, Yahoo! and AOL Mail.
WiseStamp is very easy to use: after installing it in Firefox, you'll see a tiny icon in the browser's bottom right corner from where you can enable or disable the extension, as well as choose between the two only available signatures: business or personal.
You can totally customize each signature: choose fonts and colors, add links to Internet sites, display a small image, link to your profile on a dozen different social networks… the choice is yours.
WiseStamp offers also a preview window to make sure your signature looks nice before saving your work. Pity it doesn't save and sync signatures across computers, which means you'll have to manually create and configure your signature in every single computer you access webmail from.
With WiseStamp you'll be able to create and use completely customized HTML signatures in your webmail system.