I have a few of these!

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I fully agree with it being yellow. By far, the most common isotope of uranium is uranium-238, which is indeed radioactive, but not dangerously radioactive. In this list, lead is listed as a yellow because it can give you heavy metal poisoning. In this scenario, the uranium would cause more damage to your body by damaging it as lead would (heavy metal poisoning affecting brain, kidneys, liver, etc) before the radiation would ever have an impact on your body.

YouTube made some minor UI changes, which caused the current version of Return YouTube Dislike in the Mozilla Addons Store to not work. A fix has been submitted for review to Firefox and other browser stores, but that takes time and Mozilla has get to accept the new version. Adding the current version manually from their GitHub page does work just fine, if you don’t feel like waiting.

https://github.com/Anarios/return-youtube-dislike/issues/944