Webdriver logs for Firefox

Question

Both Chrome and PhantomJS selenium drivers can log everything that is going on the browser side. By specifying the service log path while initializing the driver, you can control where the logs would be written to. E.g. for chrome (in Python):

from selenium import webdriver

driver = webdriver.Chrome(service_log_path="/tmp/log")
driver.get("http://www.google.com")
driver.close()

After executing the code, /tmp/log file would contain the service logs which is helpful for debugging:

[0.985][INFO]: Launching chrome: ...
[2.620][INFO]: RESPONSE InitSession {
   "acceptSslCerts": true,
   "applicationCacheEnabled": false,
   "browserConnectionEnabled": false,
   "browserName": "chrome",
   "chrome": {
      "userDataDir": "/var/folders/yy/ppdg927x4zv8b0rbzg1f_jzh0000gn/T/.org.chromium.Chromium.ibsof9"
   },
   "cssSelectorsEnabled": true,
   "databaseEnabled": false,
   "handlesAlerts": true,
   "javascriptEnabled": true,
   "locationContextEnabled": true,
   "nativeEvents": true,
   "platform": "Mac OS X",
   "rotatable": false,
   "takesHeapSnapshot": true,
   "takesScreenshot": true,
   "version": "37.0.2062.120",
   "webStorageEnabled": true
}
[2.677][INFO]: Waiting for pending navigations...
[2.696][INFO]: Done waiting for pending navigations
[3.290][INFO]: Waiting for pending navigations...
[4.338][INFO]: Done waiting for pending navigations
[4.338][INFO]: RESPONSE Navigate
[4.339][INFO]: COMMAND CloseWindow {

}
[4.451][INFO]: RESPONSE CloseWindow

Is there a way to get the same information but using Firefox web driver?

From what I see in the source code, both Chrome and PhantomJS fire up new services via subprocess and pass the --log-path argument to it. And these services are responsible for the logging. As for Firefox driver, it's implementation is quite different and is based on FirefoxBinary class.

Provided example and links are Python-related, but the question is pretty much generic and language-agnostic. Would appreciate any pointers.

Answer 1

You have to set logging options in firefox profile as in developer tips link - https://code.google.com/p/selenium/wiki/DeveloperTips - for console log you should use:

FirefoxProfile p = new FirefoxProfile();
p.setPreference("webdriver.log.file", "/tmp/firefox_console");
WebDriver driver = new FirefoxDriver(p);

For browser log, you should use

webdriver.firefox.logfile 

(https://code.google.com/p/selenium/wiki/FirefoxDriver)

Hope this helps.