# Legacy Selenium Desired Capabilities > These capabilities worked with the legacy JSON Wire Protocol URL: https://deploy-preview-2974--selenium-dev.netlify.app/documentation/legacy/desired_capabilities/ Site index: https://deploy-preview-2974--selenium-dev.netlify.app/llms.txt --- This documentation previously located [on the wiki](https://github.com/SeleniumHQ/selenium/wiki/DesiredCapabilities) \ See [JSON Wire Protocol](https://deploy-preview-2974--selenium-dev.netlify.app/documentation/legacy/json_wire_protocol/index.md#capabilities-json-object) for common capabilities. ## Remote Driver Specific
Key Type Description
webdriver.remote.sessionid string WebDriver session ID for the session. Readonly and only returned if the server implements a server-side webdriver-backed selenium.
webdriver.remote.quietExceptions boolean Disable automatic screenshot capture on exceptions. This is False by default.
## Grid Specific
Key Type Description
path string Path to route request to, or maybe listen on.
seleniumProtocol string Which protocol to use. Accepted values: WebDriver, Selenium.
maxInstances integer Maximum number of instances to allow to connect to grid
environment string Possible duplicate of browserName? See RegistrationRequest
## Selenium RC Specific | Key | Type | Description | |:-------------------------|:------------------|:------------------------------------------------------------------------------------------------------------------------------| | proxy_pac | boolean | Legacy proxy mechanism. Do not use. | | commandLineFlags | string | Flags to pass to browser command line. | | executablePath | string | Path to browser executable. | | timeoutInSeconds | long integer | Timeout to wait for the browser to launch, in seconds. | | onlyProxySeleniumTraffic | boolean | Whether to only proxy selenium traffic. See browserlaunchers.Proxies | | avoidProxy | boolean | ??? See browserlaunchers.Proxies | | proxyEverything | boolean | ??? See browserlaunchers.Proxies | | proxyRequired | boolean | ??? See browserlaunchers.Proxies | | browserSideLog | boolean | ??? See AbstractBrowserLauncher. | | optionsSet | boolean | ??? See BrowserOptions. | | singleWindow | boolean | Whether to enable single window mode. | | dontInjectRegex | javascript RegExp | Regular expression that proxy injection mode can use to know when to bypss injection. Ignored if not in proxy injection mode. | | userJSInjection | boolean | ??? Whether to inject user JS. Ignored if not in proxy injection mode. | | userExtensions | string | Path to a JavaScript file that will be loaded into selenium. | ## Selenese-Backed-WebDriver specific | Key | Type | Description | |:-------------------------|:------------------|:------------------------------------------------------------------------------------------------------------------------------| | selenium.server.url | string | URL of Selenium server to use, to back this WebDriver | ## Firefox specific | Key | Type | Description | |:-----|:-------|:-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | captureNetworkTraffic | boolean | Whether to capture network traffic. | | addCustomRequestHeaders | boolean | Whether to add custom request headers. | | trustAllSSLCertificates | boolean | Whether to trust all SSL certificates. | | changeMaxConnections | boolean | ??? See FirefoxChromeLauncher. | | firefoxProfileTemplate | string | ??? See FirefoxChromeLauncher. | | profile | string | ??? See FirefoxChromeLauncher | ### FirefoxProfile settings Preferences accepted by the FirefoxProfile with special meaning, in the WebDriver API: | **Key** | **Type** | **Description** | |:--------|:---------|:----------------| | webdriver\_accept\_untrusted\_certs | boolean | Whether to trust all SSL certificates. TODO: Maybe in some way different to the acceptSslCerts or trustAllSSLCertificates capabilities. | | webdriver\_assume\_untrusted\_issuer | boolean | Whether to trust all SSL certificate issuers. TODO: Maybe in some way different to the acceptSslCerts or trustAllSSLCertificates capabilities. | | webdriver.log.driver | string | Level at which to log FirefoxDriver logging statements to a temporary file, so that they can be retrieved by a getLogs command. Available options; DEBUG, INFO, WARNING, ERROR, OFF. Defaults to OFF. | | webdriver.log.file | string | Path to file to which to copy firefoxdriver logging output. Defaults to no file (like /dev/null). | | webdriver.load.strategy | string | Experimental API. Defines different strategies for how long to wait until a page is loaded. Values: unstable, conservative. Defaults to conservative. | | webdriver\_firefox\_port | integer | Port to listen on for WebDriver commands. Defaults to 7055. | ## IE specific | Key | Type | Description | |:-----|:-------|:--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | killProcessesByName | boolean | Whether to try to kill processes by name, instead (or addition) to killing processes we happen to have handles to. | | honorSystemProxy | boolean | Whether to honor the system proxy. | | ensureCleanSession | boolean | Whether to make sure the session has no cookies or temporary internet files on Windows. I believe this is passed to the IEDriver as well, but ignored by it. | ## Safari specific | Key | Type | Description | |:-----|:-------|:-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | honorSystemProxy | boolean | Whether to honour the system proxy. | | ensureCleanSession | boolean | Whether to make sure the session has no cookies, cache entries. And that any registry and proxy settings are restored after the session. |