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Thanks!

I don't know what's in Arvid's post, but can't you go into Gmail Settings, then find a remove button for RTM under the Gadgets tab? I have not tried removing it to test, because I want to keep RTM in my Gmail.

Arvid's post was very helpful. I've just used it and it works perfectly !
Arvid says: "In FireFox, go to Tools > Addons. Here you can first disable the extension and after that uninstall it." That is to say that RTM is not add-in in gmail but add-in in Firefox itself. When you understand that, it's very easy to remove.
@manning999: There is no RTM button in gmail settings !

It depends on whether you are using the GMail Gadget or the Firefox extension.

If the RTM Gmail gadget was added in Settings->Gadgets, then it should be very simple to remove it there by clicking the remove button next to the RTM gadget. That's what I should have been more clear about.

Based on what timbokil was saying, it sounds like the gadget was installed and used, not the FF add-on.

For anyone still looking for uninstall instructions:

How to uninstall the gadget from Gmail Labs

How to uninstall the Firefox extension

Hope this helps!

I'm having this same issue. I added RTM to Gmail labs via URL and now it isn't in the list of labs gadgets to remove.

Found a workaround -- Go to the bottom of the labs gadget list an click the "Disable" radio button next to "Add any gadget by URL," then click "Save Changes." RTM should be gone now. You can re-enable Add by URL and RTM should still be gone.