Some text colors are rendered incorrectly

**Describe the bug:**
Some text colors are too low-contrast to be visible, and some sections of pages do not have the correct background color.

**Expected behavior:**
The style should make GitHub look as advertised in the README.

**Where did this happen:**
This occurs on all GitHub pages.

**Steps to reproduce:**
Unknown, it just kind of started happening.

**Screenshots:**
![gh_moonlight_repo](https://user-images.githubusercontent.com/49368915/110190909-9b532180-7e1d-11eb-8a44-75683f4a2303.png)


**Desktop (please complete the following information):**
 - OS: Void Linux (kernel version 5.10.20)
 - Browser: Firefox
 - Version: 86.0

 **Additional add-ons installed:**
* [Archive Page](https://addons.mozilla.org/en-US/firefox/addon/archive-page/)
* [Auto Tab Discard](https://addons.mozilla.org/en-US/firefox/addon/auto-tab-discard/)
* [Bypass Paywalls](https://addons.mozilla.org/en-US/firefox/addon/bypass-paywalls-firefox/)
* [Canvas Blocker](https://addons.mozilla.org/en-US/firefox/addon/canvasblocker/)
* [Chameleon](https://addons.mozilla.org/en-US/firefox/addon/chameleon-ext/)
* [ClearURLs](https://addons.mozilla.org/en-US/firefox/addon/clearurls/)
* [Decentraleyes](https://addons.mozilla.org/en-US/firefox/addon/decentraleyes/)
* [Disable WebRTC](https://addons.mozilla.org/en-US/firefox/addon/happy-bonobo-disable-webrtc/)
* [enhanced-h264ify](https://addons.mozilla.org/en-US/firefox/addon/enhanced-h264ify/)
* [Firefox Color](https://addons.mozilla.org/en-US/firefox/addon/firefox-color/)
* [Gitako](https://addons.mozilla.org/en-US/firefox/addon/gitako-github-file-tree/)
* [github-vscode-icons](https://addons.mozilla.org/en-US/firefox/addon/github-vscode-icons/)
* [Hide Files on GitHub](https://addons.mozilla.org/en-US/firefox/addon/hide-files-on-github-/)
* [Image Search Options](https://addons.mozilla.org/en-US/firefox/addon/image-search-options/)
* [Lovely forks](https://addons.mozilla.org/en-US/firefox/addon/lovely-forks/)
* [Reddit Enhancement Suite](https://addons.mozilla.org/en-US/firefox/addon/reddit-enhancement-suite/)
* [Refined GitHub](https://addons.mozilla.org/en-US/firefox/addon/refined-github-/)
* [SponsorBlock](https://addons.mozilla.org/en-US/firefox/addon/sponsorblock/)
* [startpage](https://addons.mozilla.org/en-US/firefox/addon/square-startpage/)
* [Tampermonkey](https://addons.mozilla.org/en-US/firefox/addon/tampermonkey/)
* [Tree Style Tab](https://addons.mozilla.org/en-US/firefox/addon/tree-style-tab/)
* [True Sight](https://addons.mozilla.org/en-US/firefox/addon/detect-cloudflare-plus/)
* [uBlock Origin](https://addons.mozilla.org/en-US/firefox/addon/ublock-origin/)
* [uMatrix](https://addons.mozilla.org/en-US/firefox/addon/umatrix/)

I think it's worth noting that I'm using [arkenfox user.js](https://github.com/arkenfox/user.js). Also, none of the available theme settings make things look right:
![Screenshot_2021-03-06 Build software better, together](https://user-images.githubusercontent.com/49368915/110191896-f0456680-7e22-11eb-94e2-c378dd95ced9.png)


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Some text colors are rendered incorrectly #70

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Some text colors are rendered incorrectly #70

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