After I upgrade my firefox to 4.0, the plugin is gone. I tried to reinstall it also can’t work. Any solution?
Yes, expect plugins to not work when a new major version is released. This is very common and the publishers of the plugins need to develop a new version, this takes time.
Immediate solution: Install previous version of your browser.
Alternate solution: Wait for plugin update to be released.
Yes, facing the same problem…