Scroll down this page to find Phoenity Orbit
Found this one just this morning...
Orbit Yellow - A Px Classic (my personal favorite) clone for FF 1.0.
Orbit Grey is available from...
Also, did you know you can update old themes yourself fairly easily?
Download the theme instead of installing it directly from the web.
Extract the downloaded .jar file into a new folder using winzip or similar.
(change the file extension from .jar to .zip if you have any problems opening the compressed file - just be sure to change it back to .jar when you're done)
Look for a file called install.rdf. Open it with notepad and look for a line of code that will look something like this:
Change the max version number from 0.9.0+ to 1.0+
Save and close install.rdf then zip everything back into a .jar file.
Install the theme as usual by dragging and dropping it into the firefox themes window.
A small warning though - when using this little hack, some new firefox features that weren't present in previous versions might not be displayed when using an old theme.
As for the strikethrough tag, I think that just plain didn't work since we changed to VB.