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(Firefox Quantum beta) Textbox text disappears into background color

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I just downloaded the Firefox Quantum 57.0beta and I noticed that some textboxes (e.g. search box inside a website, login and password boxes) turn black and whatever I type in also shows up as black text (or conversely, some websites with white textbox background and whatever I type in shows up as white text), making it difficult to see what I am entering unless I highlight it (see attached screencap). This did not happen with versions 56 and prior.

I just downloaded the Firefox Quantum 57.0beta and I noticed that some textboxes (e.g. search box inside a website, login and password boxes) turn black and whatever I type in also shows up as black text (or conversely, some websites with white textbox background and whatever I type in shows up as white text), making it difficult to see what I am entering unless I highlight it (see attached screencap). This did not happen with versions 56 and prior.
Attached screenshots

Modified by willowness

All Replies (3)

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I wonder if that is a bug in the Developer Edition theme. Is there an option in Customize to switch to a light theme to see whether that makes any difference?

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I switched the theme, the problem still persists.

For the record, I have experienced the same problem with the main 57.0beta (not the developer edition) as well, but I had to remove that version from my computer as it prevented me from using the Firefox 56.0 that was already installed on my computer.

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Can you find the source of the background color? The attached screenshot of the Inspector is from Nightly which may differ from Beta/Developer.