Problem Description When using GM_xmlhttpRequest in ScriptCat, the onload and onerror callbacks are not triggered. The test userscript works in both Tampermonkey and Violentmonkey but not in ScriptCat ...

InvalidStateError: Failed to read the 'responseText' property from 'XMLHttpRequest': The value is only accessible if the object's 'responseType' is '' or 'text' (was 'arraybuffer').