Bugzilla

https://phabricator.services.mozilla.com/D60814#inline-368781

```
Nit: omit / on the newly added <meta> at least? Throughout, I believe:
    link
    meta
    input

don't need closing tags, and in HTML /> is meaningless. So there's more that could be done throughout this doc (e.g. the <span> and <th> nodes that only get closed by virtue of HTML parsing finding another node and closing it because of that), but I don't want to block you landing this. Up to you if you want to address those here or in another commit/bug or if you want to leave it as-is to preserve blame and will just update iteratively when changing those lines anyway.
```

All the tags mentioned above (link, meta, input, span, th) that are found in https://searchfox.org/mozilla-central/source/toolkit/content/aboutNetworking.html should be fixed.

If you want to work on this bug let me know so I will assign you to it.
If this is your first contribution this is a good place to start: https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Introduction

https://phabricator.services.mozilla.com/D60814#inline-368781

> Nit: omit / on the newly added meta at least? Throughout, I believe:
>     link
>     meta
>     input
> 
> don't need closing tags, and in HTML /> is meaningless. So there's more that could be done throughout this doc (e.g. the span and th nodes that only get closed by virtue of HTML parsing finding another node and closing it because of that), but I don't want to block you landing this. Up to you if you want to address those here or in another commit/bug or if you want to leave it as-is to preserve blame and will just update iteratively when changing those lines anyway.

All the tags mentioned above (link, meta, input, span, th) that are found in https://searchfox.org/mozilla-central/source/toolkit/content/aboutNetworking.html should be fixed.

If you want to work on this bug let me know so I will assign you to it.
If this is your first contribution this is a good place to start: https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Introduction