I have never done the automatic update for Firefox. I don't like the update that way. Also, the automatic update is often slow, and can take a day or two before it informs you that new version is available. I come to know about updated version a lot earlier, and I just download the setup and install it.
About the plugin check, sometimes, it does not work on first try. Just refresh it, and it will work.
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Anupam
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