Diagonal RGB lines appearing instead of some images
On some websites, such as https://mapgenie.io/elden-ring/maps/the-lands-betweenm images appear as these diagonal lines. Opening these websites in other browsers doesn't present the same issue.
Solution choisie
This is likely caused by having enabled "Resist Fingerprinting" since having set the user agent set to Firefox 91.0 is one of the consequences.
You can allow canvas access via "Tools -> Page Info -> Permissions".
- Tools -> Page Info -> Permissions -> Extract Canvas Data
You can also set this pref to false.
- about:config => privacy.resistFingerprinting.autoDeclineNoUserInputCanvasPrompts = false
You can open the about:config page via the location/address bar. You can click the button to "Accept the Risk and Continue".
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I'm not sure why the image I attached uploaded as greyscale actually.
I have never experienced such an issue. It could be hardware acceleration or you have the preference to "resist fingerprinting" set to true. https://support.mozilla.org/en-US/kb/forum-response-disable-hardware-acceleration https://support.mozilla.org/en-US/kb/firefox-protection-against-fingerprinting
Solution choisie
This is likely caused by having enabled "Resist Fingerprinting" since having set the user agent set to Firefox 91.0 is one of the consequences.
You can allow canvas access via "Tools -> Page Info -> Permissions".
- Tools -> Page Info -> Permissions -> Extract Canvas Data
You can also set this pref to false.
- about:config => privacy.resistFingerprinting.autoDeclineNoUserInputCanvasPrompts = false
You can open the about:config page via the location/address bar. You can click the button to "Accept the Risk and Continue".
Thank you, cor-el and terry, that fixed it