As Maja and I have seen yesterday also browsertime makes use of the CDP protocol for certain features. And right now they have a webextension installed in Firefox to accomplish specific tasks.

https://github.com/sitespeedio/browsertime/blob/master/lib/chrome/webdriver/chromeDevtoolsProtocol.js

We should add dependencies for each and everything which is needed. I hope that Peter can give us the full list of methods and events.

For Firefox we would like to use:

• Set request headers - Network.setExtraHTTPHeaders
• Set cookies - Network.setCookie
• Inject JS on the page on new document - Page.addScriptToEvaluateOnNewDocument
• Block domains - Network.setBlockedURLs
• Clear browser cache - Network.clearBrowserCache and Network.clearBrowserCookies

We use a couple of more for Chrome but they aren't super important:

• Tracing.start, Tracing.end and Tracing.tracingComplete
• Emulation.setCPUThrottlingRate (we prefer that users don't use that for Chrome but maybe it works better in Firefox?)
• Performance.getMetrics()

(In reply to Peter Hedenskog from comment #1)

For Firefox we would like to use:

• Set request headers - Network.setExtraHTTPHeaders
• Set cookies - Network.setCookie
• Inject JS on the page on new document - Page.addScriptToEvaluateOnNewDocument
• Clear browser cache - Network.clearBrowserCache and Network.clearBrowserCookies

I added related bugs for all of those commands to the dependency list.

• Block domains - Network.setBlockedURLs

This is experimental. Not sure if that will be implemented (yet).

We use a couple of more for Chrome but they aren't super important:

• Tracing.start, Tracing.end and Tracing.tracingComplete
• Emulation.setCPUThrottlingRate (we prefer that users don't use that for Chrome but maybe it works better in Firefox?)
• Performance.getMetrics()

None of those are implemented yet. And nothing is scheduled for those yet.

The related issue in browsertime is https://github.com/sitespeedio/browsertime/issues/1170.