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Camera usage notification at mozilla firefox

I'm writting an automatied test with using selenium dirver and geckoDriver for mozilla firefox v56. The application which I'm testing always ask user to allow the camera usage and always this notification is displayed:
The problem is that, the Mozilla browser session which is created by geckoDriver does not saved settings where I always allow this page to use the camera driver.
I'm talking about this solution: https://support.mozilla.org/en-US/kb/firefox-page-info-window
I cannot find any parameter in about::config page which which I can run firefox to never ask about this permission again. Can I ask for your help?

WebPage works if opened manualy. Returns "Window language could not be determined" if opened via Selenium

I am dealing with a small problem. I am working on automating few tasks in a web application,i can open the webpage,enter the login,click login,BUT then it starts to act strange. If i click on the login manualy it logs in without a problem.
But if i try to do it via selenium (JAVA jdk1.7.0_75,selenium-java-2.53.1,running on IEDriverServer_Win32_3.4.0) the page opens with error An error has occured.
java.lang.NullPointerException. and with "Window language could not be determined "
The page is on the intranet. I guess the application has a problem with the Webdriver (everything works if i try to automate the task using the VBS).
Dont you know any "workaround" for that?
(I can use only IE,because chrome no longer supports NPAPI so the application does not work in chrome)
InternetExplorerDriver driver = new InternetExplorerDriver();
driver.get("*the webpage*");
driver.findElementByName("userid").sendKeys("*login*");
driver.findElementByName("password").clear();
driver.findElementByName("password").sendKeys("*password*");
driver.findElementByName("ctr").sendKeys("*number*");
driver.findElementByName("menuType").click();
driver.findElementByLinkText("OK").click();
I think the problem is somewhere in the settings,because as i mentioned,if o open the browser manualy and login,it works,no errors and i get into the app.
But the webdriver "browser" has somehow different settings (i think) so it does not work. Problem is,that we have restricted access to the settings of browser,so i cant do much about that.
Thank you very much for any suggestions/answers/tips!!
Kind Regards,
Jerry Woodburn

Selenium FirefoxDriver initialization

When I am trying to load the Selenium FireFoxDriver, process is taking more time to invoke the browser. I have tried for lot of options like disabling the auto updates and etc. But all efforts are in vain. So I have decided to load the FirefoxDriver on startup of the Server (i.e, with load-on-startup time as 0 in web.xml when container initializes). Are there any cons with this approach? Also please suggest if there is any better way to do this.
Thanks in advance!!!

In general, WebDriver supports Firfox and Safari browsers by default. There is no need to perform any configuration for this. Please find below for the sample code which initializes the browser
WebDriver driver = new FirefoxDriver();
driver.get("http://www.google.com/");
The above code will start the firefox browser installed in your machine and launches the google page. If there is a mismatch between the selenium version of firefox version the browser will be started, but would not launch the google application.
Hope this helps.

What is the mechinism used for commiunication between webdriver and browser

Anyone can explain how communication happen between browser and web-driver?. How does webdriver object read and identify html elements in browser ?. For that what is the relationship between webdriver object and browser and how to build the relationship browser and webdriver object?
driver = new FirefoxDriver();
driver.findElements(By.id("element"));

The communication between webdriver and browser happens through a json-wire protocol which is specified in the W3C documentation. All browsers that webdriver supports, uses this same protocol.
How does webdriver read and identify elements in a page? This varies from browser to browser.
Firefox - webdriver gets installed as a plugin in your browser while running the test. The webdriver server will send the json-commands to this plugin and those commands will get executed in the browser. The plugin is built within the webdriver jar file. It will get installed while running the test.
Chrome - For testing chrome, you would also need a chromedriver.exe file. This chromedriver.exe acts similar to the firefox plugin. It can receive the commands from webdriver server and execute it on the browser
IE - Similar to Chrome, IE executes with the help of InternetExplorerDriver.exe.
You can understand more about the functioning by looking at the different DriverFile source code in github.
You can also get an understanding about the working from here - http://www.aosabook.org/en/selenium.html.
I am not sure how updated this page is, but should help to understand the concept.

Error communicating with the remote browser. It may have died

I'm new in Selenium. I'm using FirefoxDriver(). So, basically when i run my program. It opens an external firefox browser, So when i close that firefox browser. my program terminates and says Error communicating with the remote browser. It may have died.
But How to make my program run, After closing browser it should suppose to run and show on console program? Is that possible? Please let me know.
Surely, help would be appreciated!

Try WebDriver driver = new HtmlUnitDriver();.
This does not open any external browser.