document.body must not return null at document_end state
Manifest: "content_scripts":[{ "all_frames": true, "matches": ["https:///"], "js": ["test.js"], "run_at": "document_end" }],
test.js: document.body.addEventListener(...)
And try to open this page: https://via.hypothes.is/https://lists.torproject.org/pipermail/tor-onions/2019-January/thread.html
Final Result: "TypeError: document.body is null" in Browser Console.
Expected result: No error, because the script run at document_end
Tested on: Tor Browser 8.0.5
May affect on: Firefox 60.5.0esr
The reason why I post this here is bugzilla.mozilla.org doesn't let me create an account. Go easy on me.
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