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# Firefox capabilities
geckodriver has a few capabilities that are specific
to Firefox.
Most
of these [are documented on MDN](https:
//developer.mozilla.org/en-US/docs/Web/WebDriver/Capabilities/firefoxOptions).
We additionally have some capabilities that largely are
implementation
concerns that normal users should
not care about:
## `moz:debuggerAddress`
A
boolean value
to indicate
if Firefox has
to be started
with the
[Remote Protocol] enabled, which
is a
low-level debugging
interface that
implements a subset
of the [Chrome DevTools Protocol] (CDP).
When enabled the returned `moz:debuggerAddress` capability
of the `New Session`
command
is the `host:port` combination
of a server that supports the following
HTTP endpoints:
### GET /json/version
The browser version metadata:
```json
{
"Browser":
"Firefox/84.0a1",
"Protocol-Version":
"1.0",
"User-Agent":
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:84.0) Gecko/20100101 Firefox/84.0",
"V8-Version":
"1.0",
"WebKit-Version":
"1.0",
"webSocketDebuggerUrl":
"ws://localhost:9222/devtools/browser/fe507083-2960-a442-bbd7-7dfe1f111c05"
}
```
### GET /json/list
A list
of all available websocket targets:
```json
[ {
"description":
"",
"devtoolsFrontendUrl": null,
"faviconUrl":
"",
"id":
"ecbf9028-676a-1b40-8596-a5edc0e2875b",
"type":
"page",
"url":
"https://www.mozilla.org/en-US/",
"browsingContextId":
29,
"webSocketDebuggerUrl":
"ws://localhost:9222/devtools/page/ecbf9028-676a-1b40-8596-a5edc0e2875b"
} ]
```
The contained `webSocketDebuggerUrl` entries can be used
to connect
to the
websocket
and interact
with the browser by using the CDP protocol.
[Remote Protocol]: /remote/index.rst
[Chrome DevTools Protocol]: https:
//chromedevtools.github.io/devtools-protocol/
## `moz:webdriverClick`
A
boolean value
to indicate which kind
of interactability checks
to run when performing a click
or sending keys
to an elements.
For
Firefoxen prior
to version
58.
0 some legacy code
as imported from
an older version
of FirefoxDriver was
in use.
With Firefox
58 the interactability checks
as required by the
[WebDriver] specification are enabled by default. This means
geckodriver will additionally check
if an element
is obscured by
another when clicking,
and if an element
is focusable
for sending
keys.
Because
of this change
in behaviour, we are aware that some extra
errors could be returned.
In most cases the test
in question might
have
to be updated so it
's conform with the new checks. But if the
problem
is located
in geckodriver,
then please
raise an issue
in
the [issue tracker].
To temporarily disable the WebDriver conformant checks use `false`
as value
for this capability.
Please note that this capability exists only temporarily,
and that
it will be removed once the interactability checks have been
stabilized.