Rated 5 out of 5 stars
Glad most people are finding this useful.
@BudMan, I am not really familiar with BSD (more a Linux guy) Did you download a copy from the link I provided? If not and you downloaded it off of here it definitely will not work. That error message is usually caused by the .xpi file not getting unpacked. Try following these steps:
1) Download from http://www.megaupload.com/?d=HWX605SS
2) Remove your existing copy of 1 Click Weather from Firefox and restart it.
3) Click on File->Open File and select the version you downloaded from above.
4) Install it and enjoy!
If that doesn't work, then you'll have to look in the .mozilla directory in your home directory and see if it unpacked it or not. If it didn't you should just be able to unpack the .xpi file (just a zip file) manually into a subdirectory and restart Firefox.
@ononoma Not sure why you're having an issue with MU. I have never had any issues with them, which is why I have it hosted there. Have you tried using a download manager such as JDownloader?