Firefox images should support CDP

[leipreachan]

Firefox and geckodriver provide support of CDP

https://firefox-source-docs.mozilla.org/testing/geckodriver/Capabilities.html#moz-debuggeraddress

a solution similar to https://github.com/aerokube/images/tree/master/static/chrome/devtools can be added to Firefox images so users could interract with them

the may differences:

• the user should provide capability "moz:debuggerAddress = true" to let geckodriver know that the functionality should be enabled
• the capability "moz:debuggerAddress" in the reply holds host:port value of the devtools WS
• geckodriver requires "Host" header to be correct when initializing WS connection (chromedriver ignores it)