Firenvim not loading on latest Firefox nightly

[ahal]

• OS Version: Linux (Fedora 31)
• Browser Version: Firefox Nightly 72.0a1 (2019-11-15)
• Firenvim extension: 0.1.13
• What I tried to do: Click a textarea
• What happened: Firenvim fails to load (white box flashes quickly, then textarea loses focus). Upon double clicking, can edit text area normally (no firenvim).

Content console contains:

Firefox can’t establish a connection to the server at ws://127.0.0.1:37195/585407150. Neovim.ts:17:19
Port disconnected for element #content-input. Neovim.ts:23:16

Browser console contains:

Promise resolved after context unloaded        nvimui.js:6148
NS_ERROR_FAILURE: Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIInterfaceRequestor.getInterface] 3 network-response-listener.js:84
Promise resolved after context unloaded    nvimui.js:6148

I had actually just installed Firenvim today, and it was working great. Then updated to today's nightly and it stopped working. I also work at Mozilla so if this is an issue on Firefox's end, I can help raise it.

[glacambre]

Thanks for reporting this. The problem is that the Origin key of the websocket header isn't present so the neovim process cannot verify that the websocket request has been made from the firenvim webextension and not another extension/website.
I consider this a firefox bug and opened https://bugzilla.mozilla.org/show_bug.cgi?id=1596889. Let's hope it'll get fixed faster than the other bugs I reported :).

[ahal]

Unfortunately it looks like it may have been intentionally removed to help prevent fingerprinting. We'll see what Tom says, but this might end up needing an alternative workaround.

[glacambre]

Discussion now happening in https://bugzilla.mozilla.org/show_bug.cgi?id=1592721 .

[ahal]

Just noting the change that caused this failure was backed out, so Firenvim is temporarily working on Nightly again (until it re-lands).