How to make it work with newer Firefox Rated 5 out of 5 stars

1. Download the addon as a normal file (don't install it)
2. Change its extension from xpi to zip.
3. Unpack the archive to a folder
4. Browse the folder and look for install.rdf
5. Edit the file with notepad
6. Change the line:
7. Save the file
8. Repack the folder with zip archiver or winrar
9. Change its extension back to .xpi
10. Drag & drop the addon on firefox window to install it