In Firefox I use Backspace key to go back (about:config > browser.backspace_action set to 0). Sometimes that results in this message from NoScript code, in both Browser Console and the Terminal in which Firefox is running -
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TypeError: can't access property "ownerDocument", el is null onScriptDisabled.js:66:17
onScriptDisabled moz-extension://********-****-****-****-************/content/onScriptDisabled.js:66
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if ((el && ev.code === "Delete") || ev.code === "Backspace") {
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>> null && false || true
true
>> null && (false || true)
null