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Firefox with Greasemonkey: When a certain kind of message lands in your Gmail inbox, you want to make a filter in a flash to snag future email like it. The Gmail Filter Assistant Greasemonkey script lets you do just that. While you're looking at a Gmail message from someone or about something you want to automatically process a certain way, click on the Filter Assistant to define your criteria, pre-filled with message-specific inputs (to, from and subject.)
All platforms with Firefox: The WiseStamp beta Firefox add-on edits, saves, and applies rich HTML signatures to your web-based email accounts, including Gmail, Yahoo Mail, Hotmail, and AOL mail. With WiseStamp installed, you get a rich HTML editor that lets you create signatures with links, colors, images, and formatting, plus links to your favorite social network profiles. You can make more than one signature, too—like personal and business. Once you're in your webmail account, WiseStamp adds a signature drop-down so you can choose which sig to use with the current email, or it can insert it automatically. Take a look at some screenshots of WiseStamp in action.Launch WiseStamp's preferences pane to start creating your signatures. By default WiseStamp includes a small WiseStamp advertisement at the bottom of your signature.