Graphic output mulfunction on Tor browser

Ecardo

Running Ubuntu 14.04 on HP Probook 6550b. Installed latest Tor browser version 11.5.2 and graphics output is faulty and does not work.

Last errors occured inside Windy app. If present, these can help us to identify the issue and fix it quickly. Please note, that some issues do not cause any problems and some issues are not fixable.
Sweet, no errors reported :-)

About this version

Target: index.html
Version: 37.1.12
Built: 2022-08-25, 07:37
Your browser: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0
WebGL particles: not

ecmwf

{
"v": "2.3",
"ref": "2022-09-01T00:00:00Z",
"update": "2022-09-01T07:18:05Z",
"dst": [
[
1,
1,
90
],
[
3,
93,
144
],
[
6,
150,
240
]
],
"info": "2022041100",
"premium": true,
"primary_refs": [
0,
12
],
"secondary_refs": [
6,
18
],
"secondary_ref_length": 90
}

About this version

Target: index.html
Version: 37.1.12
Built: 2022-08-25, 07:37
Your browser: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0
WebGL particles: not

Bildschirmfoto vom 2022-09-01 10:34:20.png

Korina

@Ecardo Hello, I suggest trying the "Graphic compatibility mode" in the settings. Or trying a different internet browser.

Ecardo

@Korina said in Graphic output mulfunction on Tor browser:

Graphic compatibility mode

Helo Korina, the Graphic compatibility mode does not resolve the problem. Windy.com works on Firefox so I wonder why it doesn't work on Tor browser , because this browser is based on Firefox.

Korina

@Ecardo Do you have any special settings in the browser? Also, what device and OS do you use?

Ecardo

@Ecardo I already gave the info, see first sentence above.
I think the tor browser project is using old Firefox libraries which may cause the problem. I will tell the problem to the tor project.

Ecardo

@Ecardo I ask a Tor browser help desk on Telegram and got following explanation which solved the problem:

Tor Project Support, [02.09.22 00:24]
Hello! As part of it's anti-fingerprinting defenses, Tor Browser blocks HTML5 Canvas Image Extraction. This can cause some issues with websites and that seems to be the issue here. Studies show that the Canvas can provide an easy-access fingerprinting target: The adversary simply renders WebGL, font, and named color data to a Canvas element, extracts the image buffer, and computes a hash of that image data. Subtle differences in the video card, font packs, and even font and graphics library versions allow the adversary to produce a stable, simple,high-entropy fingerprint of a computer. In fact, the hash of the rendered image can be used almost identically to a tracking cookie by the web server.

Tor Project Support, [02.09.22 00:27]
That said, you might get a prompt on the top left of the URL bar. You can allow the website to temporarily 'Extract Canvas data' for the images to fully render.

Thanks Korina (nice to meet you)

Korina

@Ecardo Thank you for posting their reply. Yes, special settings for WebGL may cause issues you are currently experiencing.

Ecardo

@Ecardo Yep - it's a built in security feature in this TOR browser, so it becomes my favorite.