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docs(readme): update cross-browser FAQ (#5634)

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@ -298,15 +298,13 @@ See [Contributing](https://github.com/puppeteer/puppeteer/blob/master/CONTRIBUTI
#### Q: What is the status of cross-browser support?
Historically, Puppeteer supported Firefox indirectly through puppeteer-firefox, which relied on a custom, patched version of Firefox. This approach was also known as “Juggler”.
After discussions with Mozilla, we collectively concluded that relying on custom patches was infeasible.
Since then, we have been collaborating with Mozilla on supporting Puppeteer on “stock” Firefox.
From Puppeteer v2.1.0 onwards, as an experimental feature, you can specify [`puppeteer.launch({product: 'firefox'})`](https://github.com/puppeteer/puppeteer/blob/v2.1.1/docs/api.md#puppeteerlaunchoptions) to run your Puppeteer scripts in Firefox Nightly, without any additional custom patches.
Official Firefox support is currently experimental. The ongoing collaboration with Mozilla aims to support common end-to-end testing use cases, for which developers expect cross-browser coverage. The Puppeteer team needs input from users to stabilize Firefox support and to bring missing APIs to our attention.
We will continue collaborating with other browser vendors to bring Puppeteer support to browsers such as Safari.
From Puppeteer v2.1.0 onwards you can specify [`puppeteer.launch({product: 'firefox'})`](https://github.com/puppeteer/puppeteer/blob/v2.1.1/docs/api.md#puppeteerlaunchoptions) to run your Puppeteer scripts in Firefox Nightly, without any additional custom patches. While [an older experiment](https://www.npmjs.com/package/puppeteer-firefox) required a patched version of Firefox, [the current approach](https://wiki.mozilla.org/Remote) works with “stock” Firefox.
We will continue to collaborate with other browser vendors to bring Puppeteer support to browsers such as Safari.
This effort includes exploration of a standard for executing cross-browser commands (instead of relying on the non-standard DevTools Protocol used by Chrome).
#### Q: What are Puppeteer’s goals and principles?
The goals of the project are: