You may have noticed that both Firefox 3.5.3 and 3.0.14 will warn if an outdated version of the Abobe Flash Player plugin is installed.
This is because old versions of plugins can cause crashes and other stability problems, and can also be a significant security risk. But this was just one of the first important steps in providing a safer and more stable experience when using plugins.
Additionally, the awesome WebDev team have been developing a Plugin Check web page that will look at all your plugins, and warn you which ones are out of date and therefore potentially have security or stability issues. And since finding and installing an updated plugin can also be tedious, that page will also provides a link to the latest version of each outdated plugin. They’re still testing to make sure the majority of plugins are detected correctly, so are asking for your help in testing it. You can help out and try it yourself, by visiting https://www.mozilla.com/plugincheck/
Firefox 3.6 will have this integrated to make sure users know when they have an outdated plugin installed, without having to manually visit the Plugin Check page. Whenever you load a page that uses a plugin that is out of date, you’ll get this warning:
Clicking on “Update Plugins…” will bring you to the Plugin Check page. Additionally, the Plugins tab of the Extension Manager (Tools -> Add-ons) will indicate which of your plugins are out of date. You can also get to the Plugin Check page from there.
This is in the latest nightly builds of Firefox (trunk and branch), and will be in Beta 1. Since the Plugin Check page is still being tested, and not yet available via the main mozilla.com site, the URL that the nightly builds of Firefox have is to a non-existent page. This will of course be fixed once the Plugin Check page has had more testing.
Updated 30/10/09: Changed the URL for the Plugin Check page to point to the production-version.