Breaks JSON-LD Playground T_T

[BigBlueHat]

https://json-ld.org/playground/

I've not yet sorted out why/how exactly...but disabling this extension brought the JSON-LD Playground back to life.

[Treora]

Apologies for the inconvenience, thanks for reporting, fixed it now.

Apparently setting window.onload in a content script in Firefox will override the website's own value for it, while in Chromium it does not. (the window object is largely shared with the page, but not completely, in ways I have yet to fully grasp)

The obvious solution is using window.addEventListener('load', .....), which is preferable anyhow.