Firefox Addon throwing ReferenceError: Components is not defined

For the work that I do, I have to upgrade my browsers often and work with the latest releases. However with the recent upgrade to Firefox 5, a bunch of addons keep throwing the following error.

ReferenceError: Components is not defined

After looking through the source code in a bunch of xpi plugins and unable to find anything wrong, I ended up reinstalling the addons and it got all the addons working again. You’ll need to either uninstall the addon or just try installing it again, as getting FF to update the addon does not resolve the issue.