fix: remove CDP-specific preferences from defaults for Firefox

[OrKoN]

Closes #11474

[whimboo]

After a discussion with @OrKoN yesterday and some additional investigation on our side I found the problem that is causing some tests around out-of-process iframes to fail. I filed https://bugzilla.mozilla.org/show_bug.cgi?id=1867667 and we will work on it shortly.

We should wait for it to be fixed on Nightly and then retrigger the tests on this PR.

[whimboo]

Code-wise this looks all fine. Lets see what happens with test results once we have the contentWindow issue fixed.

[whimboo]

3 out of 5 failures are fixed now in the recent version of Firefox Nightly. We took a brief look at the remaining two failing tests and they are related to a click on an element that is within a cross-origin iframe. Hereby the click doesn't happen with the iframe's browsing context reference but the one for the top-level browsing context.

@OrKoN and @sadym-chromium I assume that this is expected? If yes, does it block landing these pref changes?

[OrKoN]

@whimboo I believe this behavior is expected from Puppeteer's perspective. It does not work in Firefox only for now or is our expectation not spec-compliant?

[whimboo]

@whimboo I believe this behavior is expected from Puppeteer's perspective. It does not work in Firefox only for now or is our expectation not spec-compliant?

We are having a project early next year to add support for dispatching events from the parent process asynchronously. Until then the event needs to be submitted from the same browsing context.

Maybe we keep the site isolation feature off for now to keep it working, or turn it off by default and file an issue with details for a workaround for now in case cross-origin iframes are involved.

What would be your option?

[OrKoN]

Let's keep it working for now by turning off the isolation feature.