The 'Check to see if your plug ins are up to date' link on the Add-ons Manager page is not working correctly. The link opens on Mozilla Student Reps page. I'm using Firefox 12.0
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This has been fixed on Mozilla's side in Bug# 752232
It tries to use https://www.mozilla.com/plugincheck/ and then gave a error instead when redirecting to https://www.mozilla.org/plugincheck/
Many Mozilla pages that were on mozilla.com have since been either changed to or is being redirected to mozilla.org and sometimes issues have arisen.
The problem has been reported as Bug 752161. You can open the Plugin Check page manually by going to the link below.