Cloudflare challenges failure regression - Browser not supported

[pal1000]

I reproduced this in Firefox using 13.6.13 from A.M.O and 13.6.16 (Tor build).
Some websites with Cloudflare challenge to reproduce with:

• https://client.petrosky.io/login
• https://www.phoronix.com/forums/
• https://search.censys.io/

Noscript configuration

noscript_data.txt

Screenshot

[pal1000]

Regression is relatively recent, there has been at most a week since I experienced it. I only used AMO builds in Firefox during this time until I decided to do some extra testing for this issue report.

I know disabling restrictions per tab and enabling them back after challenge passes works around this issue.

[hackademix]

It's due to current limitations in the Trusted Types work-around in worker patches, which are triggered when webgl or wasm are disabled.

Until this is fixed (I hope I can do it), another work-around would be ensuring that the webgl capability is enabled for cloudflare.

In your case I had to add it both to the top site and cloudflare, since you've got cascading restrictions enabled too.

[hackademix]

Does the problem persist in 13.6.16 (I cannot reproduce it anymore)?

[pal1000]

Yes, something changed and it doesn't reproduce anymore. Tested with 13.6.18.1984.

[hackademix]

I actually managed to reproduce it again (because it seems Cloudflare is not serving the same code to the same users all the time), and also think I've found a possible culprit for the existing TrustedTypes work-around being uneffective there.
Hold on...