[BUG] Firefox seems to do nothing and eventually times out

[jrieken]

Context:

• Playwright Version: 0.10.0
• Operating System: Mac

Code Snippet

We are now using playwright to run a subset of our VSCode unit tests inside different browser types. The "steps" are this

• clone vscode from https://github.com/microsoft/vscode and run yarn
• run node test/browser/index.js --browser chromium and see how tests success and fail
• run node test/browser/index.js --browser firefox and nothing happens...

At the heard of this we load mocha inside a webpage which gets our AMD loader and other things ready (this page loads without issues inside firefox). Then we use page.evaluate to tell the page what modules to load and to start tests. Tests communicate back to the node-process via page.exposeFunction-ed function using a special mocha reporter implementation.

Describe the bug

All of the above works fine in webkit and chromium but does seemingly nothing in firefox...

[enjikaka]

Also seeing Firefox just freezing here. However I also get a yellow notification on the top saying that Firefox is installing components to play audio and video. (Widevine)

[pavelfeldman]

@jrieken 👋

This looks like a dupe of #822

We assume tests are serving from the localhost to use fetch and other web features. We'll be addressing #822, but for now if you have a way to serve your test, it would mitigate it.

[jrieken]

Yeah, that's exactly it: https://github.com/microsoft/vscode/blob/93379d00b1a42ae2e00215fd3075dfe9e915da78/test/browser/index.js#L100