As a result of the creator of the original Past Modern
(which in itself was a remake of Netscape's Modern theme) not updating their theme for newer versions of Firefox (4+), I have taken the liberty of updating it. Now everyone can experience the classic feel once again, taking them back to a time that has long since passed.
Past Modern Revisited is compatible with Personas! To do this:
1. Enable the Persona of your choice, restarting the browser.
2. Enable Past Modern Revisited (or any Persona-compatible theme), restarting the browser.
3. Type 'about:config' into the location bar
4. Search for 'lightweightThemes.isThemeSelected'; toggle this so that it is true.
5. Restart the browser.
For the latest news on themes I'm currently working on, visit my blog