1794320 - fandom.com dark theme not applied automatically

Status: RESOLVED WONTFIX

(Web Compatibility :: Site Reports, defect)

Description

[08xjcec48]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:105.0) Gecko/20100101 Firefox/105.0

Steps to reproduce:

Go to about:preferences#general and set Website appearance to Dark .

Actual results:

Fandom pages like https://bomberman.fandom.com/wiki/Super_Bomberman_4 load in light mode.

You have to manually click on the icon at the top right corner of the page to enable the dark theme, which sets a simple cookie. Users who have configured Firefox to delete cookies automatically have to keep doing this again every day they open a Fandom site.

Expected results:

If a user has checked Website appearance → Dark, Firefox should enable the dark theme by setting that cookie automatically, or reach out to Fandom to ask it to respect prefers-color-scheme.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::Networking: Cookies' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 2

[Emilio Cobos Álvarez (:emilio)]

Yeah, I think realistically messing with the site cookies is not something we'll do just for theming purposes. We should ask fandom to respect prefers-color-scheme by default... Dennis, do you know if we have contacts at Fandom? I see a contact form, but they don't have any bug report category or anything, seems more targeted to sales...

Comment 3

[Dennis Schubert [:denschub]]

We don't have any direct contact. However, their support form allows sending a "bug report" without requiring an account or anything. I submitted ticket #1222725, suggesting them to respect prefers-color-scheme. I'll update this bug if there is a substantial response!

Comment 4

[Dennis Schubert [:denschub]]

They got back to me, saying

We allow the leaders of a wiki to specify whether light or dark should be default, based on the community needs. This means we aren't really set up to follow the browser setting - but it's something we can consider for the future (e.g. perhaps by allowing admins to pick "allow browser to choose").

So this seems to be a WONTFIX from our perspective, as there is nothing to do here, and the current behavior is intentional.

Comment 5

[08xjcec48]

Thank you for contacting them.

Fortunately, we can force Firefox to use the dark theme for all Fandom wikis with a simple URL hack. I've created this Request Control rule for this:

[
  {
    "uuid": "fandom-dark-theme",
    "pattern": {
      "scheme": "*",
      "host": [
        "*.fandom.com"
      ],
      "path": [
        "wikia.php?controller=ThemeApi*"
      ],
      "excludes": [
        "variant=dark"
      ]
    },
    "types": [
      "stylesheet"
    ],
    "action": "redirect",
    "active": true,
    "title": "Dark%3A%20Fandom",
    "redirectUrl": "{href/(.*)/$1&variant=dark}"
  }
]