Browser integration tests on Mac are timing out

[sandy081]

https://dev.azure.com/monacotools/Monaco/_build/results?buildId=132371&view=logs&j=3792f238-f35e-5f82-0dbc-272432d9a0fb&t=ff86458e-371d-5daa-d7a2-208b9a858585&l=435

They used to finish in 3m24s before - https://dev.azure.com/monacotools/Monaco/_build/results?buildId=132216&view=logs&j=[…]-5f82-0dbc-272432d9a0fb&t=ff86458e-371d-5daa-d7a2-208b9a858585

[sandy081]

I can confirm that tests started timing out after this commit - e880f7e.
https://dev.azure.com/monacotools/Monaco/_build/results?buildId=132394&view=logs&s=a56e7651-4213-56af-9488-c25fe636c10c

The first commit that is started happening is f0942b3

https://dev.azure.com/monacotools/Monaco/_build/results?buildId=132395&view=logs&s=a56e7651-4213-56af-9488-c25fe636c10c

Checking what commits in between would have caused it.

@mjbvz FYI

[sandy081]

Assigning to @mjbvz as one of his commits has caused this timeout.

[mjbvz]

Mac seems to be passing pretty reliably now 🤞 but now windows fails consistently on two tests

Been adding a bunch of logging to investigate this. Here's the relevant new error:

__requestfailed__ https://vscode-remote+localhost-003a8000.vscode-resource.vscode-webview.net/d%3A/a/1/s/extensions/vscode-api-tests/testWorkspace/image.png NS_ERROR_UNKNOWN_HOST

The service worker should be intercepting this request so it should never be going to the network at all here. Taking a look to see if I can figure out what is going on

[mjbvz]

Actually it's not windows specific: its Firefox specific. The windows browser tests just happen to be the only ones using Firefox

Can reproduce on Mac too