> 
>  The xpi for FF1.5-FF2 (including python binary) is just under 2.5MB on
>  Windows..  And yes this requires a separate xpi for each platform..
> 

Yeah, that would be something I'd like to avoid.  One of the nice things
about extensions is that they're lightweight.  (~150kb for FireFTP)

In any case, I wasn't planning on working on the script, just writing up
>  what I had to do to get it to work with the 1.8 branches and posting the
>  resulting Windows and Linux xpi's for FF1.5-FF2..  It doesn't matter
>  whether you think you'll use this in production, but if it is helpful in
>  making a decision or understanding the process then I will post this..
> 

I think I'll be fine for now.  I'll let you know in the future if I come
back to this.  But thanks for your feedback!  You've been very helpful.