URL: http://www.thehindu.com/sci-tech/science/the-hindu-science-quiz-top-contender-for-national-bird-and-more/article22650741.ece?homepage=true

Browser / Version: Firefox 60.0
Operating System: Mac OS X 10.12
Tested Another Browser: Yes

Problem type: Site is not usable
Description: "Snack on science" poll does not allow user to click 'next"
Steps to Reproduce:

1. Navigate to page.
2. Scroll down to "Snack on science" poll.
3. Click "Start the quiz"
4. Choose "Uranus and Neptune" for the answer to the first question.

What happens:

"Next" does not activate.

Expected result:

Next button becomes enabled and allows user to move to the next question.

Works fine in Chrome.

gfx.webrender.all: false
gfx.webrender.blob-images: 2
gfx.webrender.enabled: false
image.mem.shared: 2
layout.css.servo.enabled: true

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