The issue has been closed

The browse-code/files section is disappearing in Firefox Nightly #4402

sideshowbarker posted onGitHub

Browser version: current Firefox Nightly, 90.0a1 (2021-05-25) (64-bit) on macOS.

Open https://github.com/sindresorhus/refined-github or any other GitHub repo URL in Firefox Nightly, with Refined GitHub enabled; observe that the entire browser-code/files section disappears, and instead just the README section is shown:
Open devtools in Firefox Nightly and switch to the Inspector tab; observe that, in the div previous adjacent sibling of the readme-toc element, there’s this descendant div:
```
 <div class="js-details-container Details">
```
Observe that in the styles panel, that div element has the following associated stylesheet rule:
```
 .rgh-files-hidden .files, .rgh-files-hidden #files ~ .Details {
     display: none;
 }
```
…like this:
Toggle off the Refined GitHub add-on, and observe that the browse-code/files section reappears — and that in the Inspector, that <div class="js-details-container Details"> element no longer has that CSS stylesheet rule<br> .rgh-files-hidden .files, .rgh-files-hidden #files ~ .Details { display: none; } associated with it.
Switch to the Console tab in devtools in Firefox Nightly and, logged there, observe the following:

Content Security Policy: The page’s settings blocked the loading of a resource at inline (“script-src”). moz-extension:1:5003 Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://github.githubassets.com/assets/optimizely-c839a608.js. (Reason: CORS request did not succeed). None of the “sha512” hashes in the integrity attribute match the content of the subresource. refined-github ℹ️ latest-tag-button → The token seems to be incorrect or expired. Update it in the options. index.tsx:53:10 ℹ️ repo-age → The token seems to be incorrect or expired. Update it in the options. index.tsx:53:10 ℹ️ bugs-tab → The token seems to be incorrect or expired. Update it in the options. index.tsx:53:10

(I don’t have any idea of those console messages are related at all…)