Multiproxy Switch for Firefox 4

as one of my most loved addon the  Multiproxy Switch does not install on Firefox 4 i changed the install package to get it running:

1. Download the multiproxy_switch_1.33.xpi
2. Rename the File with .zip extension
3. Open the install.rdf with an editor
4. in line 20, just change it to"<em:maxVersion>4.0.*</em:maxVersion>"
5. Rename it back to .xpi extension
6. Double click and open with Firefox 4, install it. DONE!

It works right away! Multiproxy Switch for Firefox 4