Have you tried this link? --> https://www.mozilla.org/en-US/plugincheck/

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This evening I tried to check on plugins. They all loaded up & showed me the status of the updates, etc. Thanks for trying to help me out. Really don't know what caused my problem but it works now.

I don't have any addon such as no script or anything else but now also plugins are not getting updated.

The error is probably due to the fact I am on a very slowww dial-up connection. There is nothing I can do about that. Mozilla updates are too big for me to download on dial-up. So am I now no longer able to access the Internet without a bunch of nuisance update requests? NO affordable high-speed Internet service is available where I live.

Any number of times. Still get the same error message. Getting time-outs as well.

Can anyone walk me through how to do this? I was not able to figure out how to fix this in the Firefox preferences menu. Do I need to look in a different place?

Sorry to seem like a dum-dum, but I am having this same problem (tried the link offered and it also reverts to the "Retry" screen which doesn't work when I click on the "Retry" button), and am at a loss at how to fix it.

I have a brand new iMac (as of May 2012) and was surprised to find that I could not update an older Shockwave plug-in (which I have disabled until I can find a way to update).

Many thanks in advance.