2014389 - The Firefox's scroolbar inadequately duplicates when zooming in a DeaviantArt image

Status: UNCONFIRMED

(Core :: Layout: Scrolling and Overflow, defect)

Description

[Fernando Marcelino Muniz]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:147.0) Gecko/20100101 Firefox/147.0

Steps to reproduce:

Open a DeviantArt post with a 4K image, click on the image to open, then clicked on it again with the magnifying glass to zoom on it.

Actual results:

There are two scrollbars, the one on top is for the whole page (which is useless in this situation), and the one under is for the zoomed image (which is useful but can't be used because of the other scrollbar)

Expected results:

The page scrollbar should not be there. That would allow using the zoomed image's scrollbar.

Comment 1

[Fernando Marcelino Muniz]

For example this image:
https://www.deviantart.com/crazy31139/art/Dead-Space-Remake-Isaac-Standard-Miner-RIG-1285861781

Comment 2

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

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

Comment 3

[Timothy Nikkel (:tnikkel)]

Safari and Chrome seem to act in the same way. So a page issue?

Comment 4

[Fernando Marcelino Muniz]

The image's scrollbar does appear, but it's underneath the page's scrollbar.
Sounds like a Firefox issue where it doesn't consider the newest scrollbar to be the relevant one.

Comment 5

[Timothy Nikkel (:tnikkel)]

Hmm, that's not what I'm seeing. I tested in Chrome, Safari, and Firefox, both with classic scrollbars (always visible and taking up space) and overlay scrollbars (not always visible and not taking up space). In all cases the 3 browsers had the same behaviour and it seemed reasonable to me, although when always show scrollbars was on the second scrollbar was a little visually confusing, but the expected thing scrolled on the page regardless.

Comment 6

[Timothy Nikkel (:tnikkel)]

Maybe you can try in a fresh profile?

Comment 7

[Fernando Marcelino Muniz]

Attachment: Video_2026-02-06_09-54-41.mkv

Here is what I see.

Comment 8

[Fernando Marcelino Muniz]

(In reply to Timothy Nikkel (:tnikkel) from comment #6)

Maybe you can try in a fresh profile?

I've installed the system a week or two ago, so I don't think that would change anything.

Comment 9

[Timothy Nikkel (:tnikkel)]

Must be something specfic to how linux scrollbars work, it doesn't work like that for me on macos.

Comment 10

[Fernando Marcelino Muniz]

Attachment: Captura de imagem_20260206_133531.png

Same issue with livestreams in theater mode.

Comment 11

[Fernando Marcelino Muniz]

Attachment: Captura de imagem_20260208_093130.png

theverge news outlet's comment section also has this issue