Click here to download the add-on called ‘Better Gmail’. As you click, a yellow bar will appear across the page that will read “Firefox prevented this site (amritvatsa.blogspot.com) from asking you to install software on your computer.” Click the “Edit Options” button and allow amritvatsa.blogspot.com to ask you. Then, click on the link again. Press the Install button in the dialog box, and restart Firefox.
Once Better Gmail is installed, go to your Gmail account to see the enhancements. To turn a feature on or off, visit the extensions Preferences dialog and select or deselect the appropriate checkboxes. Refresh Gmail to see the changes.