Sourcegraph browser extension reduces code contrast on some websites

Created by: daxmc99

• Sourcegraph version: "Sourcegraph.com"
• Platform information: 20.1.16.1733 (Firefox 73.0.1)

Steps to reproduce:

1. Visit a website like https://commaok.xyz/post/intern-strings/
2. Observer code style block with sourcegraph add-on enabled

3. Observe code style with sourcegraph disabled

Expected behavior:

Sourcegraph should not drastically reduce the contrast of certain code blocks.

Actual behavior:

Sourcegraph DOES reduce the contrast of certain code blocks

Additional info:

It seems that .hljs color is the issue here. I am able to change the color of this style to fix the issue.