I hit this bug today by choosing the dark Adwaita theme in Gnome 3.28
and Firefox 65.0. It's amazing that this is an 18 year old bug. I found
it surprising the system theme did anything to webpages and had two
consecutive surprises:

- First setting the system theme to Adwaita-dark changed the Firefox theme. 
That makes sense. What was surprising was that the Firefox theme then changed 
the content of the web pages. My mental model of a browser is that within the 
page view it's a different world and there's no reason for the web to look 
different to match the browser chrome or the system theme.
- Because I didn't actually like the dark version of Firefox I switched it to 
the Light theme manually (webpages are usually light colored and so dark chrome 
in browsers looks weird). And yet even after doing this pages still had dark 
buttons and input areas. That was even stranger. Now Firefox had a light theme 
and yet the webpages were still picking up broken colors from the system theme 
inconsistent with the Firefox chrome theme.

I fixed this after some web searches by setting "widget.content.gtk-
theme-override:Adwaita". That at least sets a light theme for UI
controls and is back to looking reasonable. I found that in bug #1283086
which seems to be a 3 year old duplicate of this 18 year old bug. The
proposal for removal of all native theming in #1411425 makes perfect

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  Bad Firefox integration with dark themes

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