You can no longer check your plugin status using Check Plugins from SeaMonkey Addons Manager. The page has not been reliable for some time and now it is gone. You get an ad for Fx instead.
It was such a convenient way to check. For those of us using Firefox ESR versions and/or SeaMonkey it seems premature. Plus, for the average user it may be confusing as to how to keep up to date without that page.