Just found this from the Mozilla Foundation bug link and it worked for me.

caps.setCapability("acceptInsecureCerts",true)

How to stop Firefox from making automatic connections, But how do I disable that Firefox prompts you to set Firefox as the default browser. How do I turn off Firefox as my default browser?

I found this comment on enabling this functionality in Selenium for Java. There is also this StackOverflow question about the same issue, also for Java For Python, which was my desired target language, I came up with this, through browsing the FirefoxProfile code:

profile = webdriver.FirefoxProfile()
profile.accept_untrusted_certs = True

Which, as far as I have tested, has produced the expected behavior.

Hope this helps somebody!

disable firefox auto update registry, Select the “ Menu ” button in the upper-right corner, then choose “ Options “. Select “ General ” on the left pane. Scroll down to the “ Firefox Updates ” section. Select one of the following options as desired: Automatically install updates. Check for updates, but let me choose whether to install Select the “ Menu ” button in the upper-right corner, then choose “ Options “. Select “ General ” on the left pane. Scroll down to the “ Firefox Updates ” section. Select one of the following options as desired: Automatically install updates. Check for updates, but let me choose whether to install

No need of custom profiles to deal with "Untrusted connection" on WebDriver

DesiredCapabilities capabilities = new DesiredCapabilities();
capabilities.setCapability(CapabilityType.ACCEPT_SSL_CERTS, true);
driver = new FirefoxDriver(capabilities);

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From start to finish with all the trimmings, in C#. Note that I had installed FFv48 to a custom directory because GeckoDriver requires that specific version.

    var ffOptions = new FirefoxOptions();            
    ffOptions.BrowserExecutableLocation = @"C:\Program Files (x86)\Mozilla Firefox48\firefox.exe";
    ffOptions.LogLevel = FirefoxDriverLogLevel.Default;
    ffOptions.Profile = new FirefoxProfile { AcceptUntrustedCertificates = true };            
    var service = FirefoxDriverService.CreateDefaultService(ffPath, "geckodriver.exe");            
    var Browser = new FirefoxDriver(service, ffOptions, TimeSpan.FromSeconds(120));

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None of the above answers worked for me. I'm using: https://github.com/mozilla/geckodriver/releases/download/v0.12.0/geckodriver-v0.12.0-win64.zip

Firefox 50.1.0

Python 3.5.2

Selenium 3.0.2

Windows 10

I resolved it just by using a custom FF profile which was easier to do than I expected. Using this info https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles#w_starting-the-profile-manager on how to make a custom profile, I did the following: 1) Made a new profile 2) Manually went to the site in FF to raise the untrusted certificate error 3) Add a site exception (when the error is raised click advanced and then add exception) 4) confirm the exception works by reloading the site (you should no longer get the error 5) Copy the newly create profile into your project (for me it's a selenium testing project) 6) Reference the new profile path in your code

I didn't find any of the following lines resolved the issue for me:

firefox_capabilities = DesiredCapabilities.FIREFOX
firefox_capabilities['handleAlerts'] = True
firefox_capabilities['acceptSslCerts'] = True
firefox_capabilities['acceptInsecureCerts'] = True
profile = webdriver.FirefoxProfile()
profile.set_preference('network.http.use-cache', False)
profile.accept_untrusted_certs = True

But using a custom profile as mentioned above did. Here is my code:

from selenium import webdriver
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities

firefox_capabilities = DesiredCapabilities.FIREFOX
firefox_capabilities['marionette'] = True
#In the next line I'm using a specific FireFox profile because
# I wanted to get around the sec_error_unknown_issuer problems with the new Firefox and Marionette driver
# I create a FireFox profile where I had already made an exception for the site I'm testing
# see https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles#w_starting-the-profile-manager

ffProfilePath = 'D:\Work\PyTestFramework\FirefoxSeleniumProfile'
profile = webdriver.FirefoxProfile(profile_directory=ffProfilePath)
geckoPath = 'D:\Work\PyTestFramework\geckodriver.exe'
browser = webdriver.Firefox(firefox_profile=profile, capabilities=firefox_capabilities, executable_path=geckoPath)
browser.get('http://stackoverflow.com')

stop firefox from updating automatically, The last 2 or 3 versions have had a pre-selected pref for Firefox to Automatically install updates, and if you didn't de-select that option in the update dialog box before you restarted Firefox to install the update, that pref you had set was probably toggled on. The last 2 or 3 versions have had a pre-selected pref for Firefox to Automatically install updates, and if you didn't de-select that option in the update dialog box before you restarted Firefox to install the update, that pref you had set was probably toggled on.

In my case I was using Marionette driver instead of Firefox driver. There is an acknowledged bug (https://bugzilla.mozilla.org/show_bug.cgi?id=1103196) for it. In the meantime I'm using Firefox driver instead:

DesiredCapabilities dc = DesiredCapabilities.firefox();
dc.setCapability(CapabilityType.ACCEPT_SSL_CERTS, true);

FirefoxProfile profile = new FirefoxProfile();
profile.setAcceptUntrustedCertificates(true);

dc.setCapability(FirefoxDriver.PROFILE, profile);

// this is the important line - i.e. don't use Marionette
dc.setCapability(FirefoxDriver.MARIONETTE, false);

Webdriver driver =  new FirefoxDriver(dc);

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I added the below and then it worked for me

DesiredCapabilities desiredCapabilities = new DesiredCapabilities();
desiredCapabilities.setAcceptInsecureCerts(true);
WebDriver driver = new FirefoxDriver(desiredCapabilities);

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C#: Something have changed as options now has own attribute for this.

var ffOptions = new FirefoxOptions();
ffOptions.AcceptInsecureCertificates = true;
Driver = new FirefoxDriver(ffOptions);

Hope this helps.

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For me, using PHP facebook/webdriver I set create a profile and authorised the certified. The name of profile was selenium.

Next I initialise my selenium 3:

java -jar -Dwebdriver.firefox.profile=selenium selenium-server-standalone-3.0.1.jar

Then in FirefoxDriver.php I set const PROFILE = 'selenium';

This worked for me.

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