XenForo 2.3: Broken image uploads in Firefox with "privacy.resistFingerprinting" = true

[Steffen]

Firefox users who have enabled "privacy.resistFingerprinting" cannot upload images anymore in XenForo 2.3. This settings seems to be configurable by visiting "about.config" and maybe by installing privacy-related Firefox extensions. I'm writing this post in Firefox 129.0.2 with the mentioned setting enabled to demonstrate the issue.

Maybe XenForo could detect whether the Canvas API works as expected by drawing a small image on a canvas and checking the result as explained here...

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XenForo 2.3: Broken image uploads in Firefox with "privacy.resistFingerprinting" = true

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