@jerry Here's the stack trace:

NotFoundError: Failed to execute 'insertBefore' on 'Node': The node before which the new node is to be inserted is not a child of this node.


NotFoundError: Failed to execute 'insertBefore' on 'Node': The node before which the new node is to be inserted is not a child of this node.
    at rl (https://infosec.exchange/packs/preload-helper-CoxRgBHZ.js:8:93972)
    at xl (https://infosec.exchange/packs/preload-helper-CoxRgBHZ.js:8:104541)
    at bl (https://infosec.exchange/packs/preload-helper-CoxRgBHZ.js:8:102253)
    at vl (https://infosec.exchange/packs/preload-helper-CoxRgBHZ.js:8:99720)
    at bl (https://infosec.exchange/packs/preload-helper-CoxRgBHZ.js:8:99842)
    at vl (https://infosec.exchange/packs/preload-helper-CoxRgBHZ.js:8:99720)
    at bl (https://infosec.exchange/packs/preload-helper-CoxRgBHZ.js:8:104270)
    at vl (https://infosec.exchange/packs/preload-helper-CoxRgBHZ.js:8:99720)
    at bl (https://infosec.exchange/packs/preload-helper-CoxRgBHZ.js:8:102018)
    at vl (https://infosec.exchange/packs/preload-helper-CoxRgBHZ.js:8:99720)


get (https://infosec.exchange/packs/preload-helper-CoxRgBHZ.js:8:93972)
get (https://infosec.exchange/packs/preload-helper-CoxRgBHZ.js:8:104541)
get (https://infosec.exchange/packs/preload-helper-CoxRgBHZ.js:8:102253)
get (https://infosec.exchange/packs/preload-helper-CoxRgBHZ.js:8:99720)
get (https://infosec.exchange/packs/preload-helper-CoxRgBHZ.js:8:99842)
get (https://infosec.exchange/packs/preload-helper-CoxRgBHZ.js:8:99720)
get (https://infosec.exchange/packs/preload-helper-CoxRgBHZ.js:8:104270)
get (https://infosec.exchange/packs/preload-helper-CoxRgBHZ.js:8:99720)
get (https://infosec.exchange/packs/preload-helper-CoxRgBHZ.js:8:102018)
get (https://infosec.exchange/packs/preload-helper-CoxRgBHZ.js:8:99720)

Seems to be quite easy to trigger, just scroll around a bit (and happens both in LibreWolf and Vivaldi, even if I disable add-ons).