My first guess would be maybe webcomoat addon incorrectly hide the scrollbar. The second guess is that the website does something wrong. I don't have time to check until maybe this weekend, so if you can have a look at the style panel and see where the scrollbar-width use comes from, that would probably be very helpful. Otherwise I will check later. Keep ni? for now.
Bug 1576894 Comment 2 Edit History
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My first guess would be maybe webcompat addon incorrectly hide the scrollbar. The second guess is that the website does something wrong. I don't have time to check until maybe this weekend, so if you can have a look at the style panel and see where the scrollbar-width use comes from, that would probably be very helpful. Otherwise I will check later. Keep ni? for now.