1921989 - Firefox does not invoke service worker fetch listener for video

Status: UNCONFIRMED

(Core :: DOM: Service Workers, defect, P2)

Description

[Wootiful]

Attachment: Simple service worker with image and video testcase

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Steps to reproduce:

1. Installed the attached index.html and sw.js on a web server, an http server running on localhost in my case but will require https if remote
2. Used Firefox service worker debugger to put a breakpoint in the registered sw.js's fetch handler
3. Refreshed browser

Issue reproduced on FF 115, 130, 131 although I cannot get it to log the messages from the service worker on 131.

Actual results:

Service worker was invoked for the main HTML page, image and favicon.ico but not the video. Logging the below to the console.

SW.js: http://127.0.0.1:8081/ sw.js:14:11
SW.js: https://picsum.photos/320/180 sw.js:14:11
SW.js: http://127.0.0.1:8081/favicon.ico

Expected results:

Service worker should have been invoked for the video as well as it is on Chrome.

Comment 1

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

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

Comment 2

[erdnaxeli]

I can reproduce the issues with Firefox 133. 0.3 on Fedora 41.

Comment 3

[Shmerl]

Looks like it's affecting Element Web (Matrix) client: https://github.com/element-hq/element-web/issues/28354

Comment 4

[Bart van der Braak]

This issue is affecting us on https://chat.blender.org, which runs https://github.com/element-hq/element-web/releases/tag/v1.11.92

They have an active issue tracking this like mentioned above.

I see the following error in my browser console:

Uncaught (in promise) DOMException: The media resource indicated by the src attribute or assigned media provider object was not suitable.

Let me know if you need additional information for reproduction.

Comment 5

[Bart van der Braak]

System info:

OS: Gentoo Linux x86_64
Kernel: Linux 6.12.16-gentoo
DE: KDE Plasma 6.3.1

Browser info:

Browser: Firefox Developer Edition
Channel: aurora
Version: 128.0b6

Screenshot: https://gist.github.com/bartvdbraak/d0d81edcedc11af2d79d6cba8a707ec4?permalink_comment_id=5461033#gistcomment-5461033

Comment 6

[Shmerl]

Any news on this one? It still breaks videos in Element in latest Firefox beta.