deprecated example using a firefox plugin

_sample.java

   @Test
    public void firefoxUseExtensions() throws IOException {

        // **************************************************************************
        // profile is good for setting preferences and fiddling with browser settings
        // **************************************************************************

        // Download the extension to a local folder
        String s = File.separator;
        String extensionPath = System.getProperty("user.dir") +
                String.format("%ssrc%stest%sresources%s%s",s,s,s,s,"firebug-1.10.5-fx.xpi");

        System.out.println(extensionPath);

        FirefoxProfile profile = new FirefoxProfile();

        // stop firebug showing the first run screen by setting the last version
        // to the current one
        profile.setPreference("extensions.firebug.currentVersion", "1.10.5");

        // add the extension to firefox
        profile.addExtension(new File(extensionPath));

        // prior to 3.12.0 we could set the profile
        //WebDriver firefox = new FirefoxDriver(profile);

        // in 3.12.0 we use the option
        FirefoxOptions options = new FirefoxOptions().setProfile(profile);
        WebDriver firefox = new FirefoxDriver(options);

        firefox.get("https://testpages.herokuapp.com/selenium/basic_html_form.html");

        assertThat(firefox.getTitle(), is("HTML Form Elements"));

        firefox.quit();
    }