Uploading images with firefox are broken with resistfingerprinting=true

[spirillen]

💡 Summary

Every time I try to add a image to a post by either upload or copy/paste, the images are broken, but if I uses a different browser, things goes well.

However, when I uses the From uri the image are upload as supposed.

🥰 Expected Behavior

The images should in this text show the BSD devil

🤬 Actual Behavior

The images looks like this

https://matrix.rocks/files/18f75b42-d514-4d99-a184-93bfd48e6a92

📝 Steps to Reproduce

1. Use FireFox-ESR with enhanced privacy
2. Upload or Copy/paste any image type

💻 Frontend Environment

* Model and OS of the device(s): Ubuntu 22.03
* Browser: Firefox-esr
* Server URL: https://matrix.rocks/
* Misskey: v2024.3.1

🛰 Backend Environment (for server admin)

* Installation Method or Hosting Service: Bash script
* Misskey: v2024.3.1
* Node: v21.7.1
* PostgreSQL: 15
* Redis: 7.x
* OS and Architecture: Linux xxx 5.15.0-100-generic #110-Ubuntu SMP UTC 2024 x86_64 GNU/Linux

Do you want to address this bug yourself?

• Yes, I will patch the bug myself and send a pull request

[acid-chicken]

fyi https://bugzilla.mozilla.org/show_bug.cgi?id=1631673

[spirillen]

fyi https://bugzilla.mozilla.org/show_bug.cgi?id=1631673

Thanks for the link and info, however My mind have already been in that direction, as I uses canvas-shadow https://addons.mozilla.org/en-GB/firefox/addon/no-canvas-fingerprinting/.

So have disabled all add-ons and restarted the browser for testing, and yes I do have the fingerPrinting enabled as default, but this should be overwritten by the domain specific rules

   "EnableTrackingProtection": {
            "Value": true,
            "Locked": false,
            "Cryptomining": true,
            "Fingerprinting": true,
            "EmailTracking": true
        },

[saschanaz]

So have disabled all add-ons and restarted the browser for testing

Did you still see the problem after that? You can also try Troubleshoot Mode in about:support.

[spirillen]

Did you still see the problem after that?

Yes

You can also try Troubleshoot Mode in about:support.

That is new to me , will have a look at it later. Thanks for the suggestion

Same results

[saschanaz]

Alright, I can repro this with any PNG upload. Maybe this is related to OffscreenCanvas use? Would you mind filing an issue in https://bugzilla.mozilla.org/ and link back here?

[spirillen]

Would you mind filing an issue in https://bugzilla.mozilla.org/ and link back here?

Kinda, As I have no intention to give them any of my mail addresses. But please do feel free to do so on my behalf.

A little side note: The problem also relates to .jp?g files.

[saschanaz]

Just found https://bugzilla.mozilla.org/show_bug.cgi?id=1422862 and added this issue there.

[spirillen]

and then we wait yet another year on a solution to a "major" problem....

Thanks for committing the issue