Various "Firefox internals" sidebar links are 404 “Page not found”; developer.mozilla.org/en-US/docs/Mozilla/Gecko etc

[dipikabh]

What information was incorrect, unhelpful, or incomplete?

Starting from https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases, I clicked on various links under "Firefox internals" menu on the left TOC.

1. "Page not found" error for most of the links under "Firefox internals" menu on the left TOC. Also no way to report the problem for those pages because no "Found a problem with this page?" section at the bottom.

For example, these pages (and more) were not found:

• https://developer.mozilla.org/en-US/docs/Mozilla/Gecko
• https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Headless_mode
• https://developer.mozilla.org/en-US/docs/Mozilla/JavaScript_code_modules

2. "Firefox internals" > "Mozilla project" link works but on https://developer.mozilla.org/en-US/docs/Mozilla page, the TOC on the left suddenly disappears. Is that intentional?

MDN Content page report details

• Folder: en-us/mozilla
• MDN URL: https://developer.mozilla.org/en-US/docs/Mozilla
• GitHub URL: https://github.com/mdn/content/blob/main/files/en-us/mozilla/index.html
• Last commit: cbe151a
• Document last modified: 2020-09-15T15:48:51.000Z

[dipikabh]

Also, there are two mentions of Mozilla Project/Mozilla Projects under Firefox internals. The second link does not work.

[caugner]

Related issue: mdn/yari#5484

If I understand it correctly, this is a side-effect of moving the Mozilla documentation off MDN, see: #10928 (comment)

[caugner]

I believe @Rumyra was referring to this issue: mdn/yari#5096

[dipikabh]

I believe @Rumyra was referring to this issue: mdn/yari#5096

Yes, thanks @caugner. My issue here in mdn/content is precisely the same that @Rumyra raised (thats in mdn/yari)!! I can mark this one duplicate and close.

[dipikabh]

Duplicate of #5096

[ernstki]

Hi! Those links are still broken, and I'm confused about the relationship between this and #5096, which doesn't seem pertinent at first glance.

I'm trying to find information on headless mode, based on old Mozilla Hacks articles, blog posts, Mozilla Wiki articles, and Stack Overflow answers. Many or most of them link to https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Headless_mode, which is a 404 on MDN.

Understood that there's some justification for no longer maintaining this particular reference as part of MDN, but it seems like an important thing to mention in a repository of web development documentation, even if it's just a link to some other document. Beyond that, there's just the issue of good housekeeping when it comes to broken links.

I opened a discussion because I don't really know where to start with this, but if I were to find (or create) a resource to replace the old page(s), would someone be able to create a redirect?