Americastestkitchen.com not working with PM 32.1

[Sablesword]

Name: Pale Moon
Version: 32.1.0 (64-bit)
Build ID: 20230320161456
Update Channel: release
User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:102.0) Gecko/20100101 Goanna/6.1 Firefox/102.0 PaleMoon/32.1.0
OS: Windows_NT 6.1
Safe Mode: false

The site worked with PM 32.0.1 (and works with the 32.0.1 portable version) but now dumps a bunch of text to the browser window:

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.osano-cm-window{font-smooth:always;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothingz:auto;--fade-transition-time:700ms;display:block;font-family:Helvetica,Arial,Hiragino Sans GB,STXihei,Microsoft YaHei,WenQuanYi Micro Hei,Hind,MS Gothic,Apple SD Gothic Neo,NanumBarunGothic,sans-serif;font-size:16px;left:0;line-height:1;position:absolute;top:0;width:100%;z-index:2147483638}.osano-cm-window--context_amp{height:100%}.osano-visually-hidden{height:1px;left:-10000px;margin:-1px;opacity:0;overflow:hidden;position:absolute;width:1px}.osano-cm-button{border-radius:.25em;border-style:solid;border-width:thin;cursor:pointer;flex:1 1 auto;font-size:1em;font-weight:700;line-height:1;margin:.125em;min-width:6em;padding:.5em .75em;transition-duration:.2s;transition-property:background-color;transition-timing-function:ease-out}.osano-cm-button--type_icon{border-radius:50%;height:1em;line-height:0;min-width:1em;width:1em}.osano-cm-button:focus,.osano-cm-button:hover{outline:none}.osano-cm-close{stroke-width:1px;border-radius:50%;border-style:solid;border-width:2px;box-sizing:initial;cursor:pointer;height:20px;margin:.5em;min-height:20px;min-width:20px;order:0;outline:none;overflow:hidden;padding:0;text-decoration:none;transform:rotate(0deg);transition-duration:.2s;transition-property:transform,color,background-color,stroke,stroke-width;transition-timing-function:ease-out;width:20px;z-index:2}.osano-cm-close:focus,.osano-cm-close:hover{stroke-width:2px;transform:rotate(90deg)}.osano-cm-link{cursor:pointer;text-decoration:underline;transition-duration:.2s;transition-property:color;transition-timing-function:ease-out}.osano-cm-link:active,.osano-cm-link:hover{outline:none}.osano-cm-link:focus{font-weight:700;outline:none}.osano-cm-link--type_feature,.osano-cm-link--type_purpose,.osano-cm-link--type_specialFeature,.osano-cm-link--type_specialPurpose{cursor:help;display:block;-webkit-text-decoration:dashed;text-decoration:dashed}.osano-cm-link--type_denyAll{display:block;text-align:right}[dir=rtl] .osano-cm-link--type_denyAll{text-align:left}.osano-cm-link--type_vendor{display:block}.osano-cm-vendor-link{font-size:.75em}.osano-cm-list-item{margin:0}.osano-cm-list-item--type_term{border-top-style:solid;border-top-width:1px;font-size:.875rem;font-weight:400;margin-bottom:.25em;margin-top:.5em;padding:.5em .75rem 0;position:relative;top:-1px}.osano-cm-list-item--type_description{font-size:.75rem;font-weight:lighter;padding:0 .75rem}.osano-cm-list{list-style-position:outside;list-style-type:none;margin:0;padding:0}.osano-cm-list__list-item{text-indent:0}.osano-cm-list--type_description{margin:0 -1em}.osano-cm-list:first-of-type .osano-cm-list__list-item:first-of-type{border-top-width:0;margin-top:0;padding-top:0}.osano-cm-toggle{align-items:center;display:flex;flex-direction:row-reverse;justify-content:flex-start;margin:.25em 0;pointer-events:auto;position:relative}.osano-cm-toggle__label{margin:0 .5em 0 0}[dir=rtl] .osano-cm-toggle__label{margin:0 0 0 .5em}.osano-cm-toggle__switch{border-radius:14px;border-style:solid;border-width:2px;box-sizing:initial;color:transparent;display:block;flex-shrink:0;height:18px;line-height:0;margin:0;position:relative;text-indent:-9999px;transition-duration:.2s;transition-
*truncated rather than pasting the entire dump*

From the browser console:

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GET 
https://d1nfaf380zbiur.cloudfront.net/_search_assets/onboarding-widget-f4fb584e76fe8604292e78d0c68b9237.js [HTTP/2.0 404 Not Found 16ms]
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://d1nfaf380zbiur.cloudfront.net/_search_assets/onboarding-widget-f4fb584e76fe8604292e78d0c68b9237.js. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing).  
(unknown)
No Event  
_app-d50ef2fcd4bce8c5.js:1:961711
Use of Mutation Events is deprecated. Use MutationObserver instead.  
Direct_links_out.user.js:320:8
Pinterest Tag Error: 'load' command was called multiple times.  Previously for tag id '2613960515200', now for tag id '2613960515200'.  
_app-d50ef2fcd4bce8c5.js:1:961711

[FranklinDM]

The page has the following CSS code:

Code: Select all

:where(:not(html,iframe,canvas,img,svg,video,audio,del):not(svg *,symbol *)) {
    all: unset;
    display: revert;
}

With PM 32.1, we're now able to parse the :where() selector and :not() with a selector list. However, we don't support the "revert" value for the display property which they use in that rule (see Issue #2045 (UXP). As a result, style elements which are supposed to be hidden are displayed, with the display property being set to "inline" by default.

A temporary workaround would be to flip the layout.css.is-where-pseudo.enabled pref to false in about:config, but note that this will break other sites that use this CSS feature.