selenide
diff --git a/‎src/main/java/com/codeborne/selenide/webdriver/FirefoxDriverFactory.java‎
Lines changed: 19 additions & 0 deletions b/‎src/main/java/com/codeborne/selenide/webdriver/FirefoxDriverFactory.java‎
Lines changed: 19 additions & 0 deletions
diff --git a/‎src/test/java/com/codeborne/selenide/webdriver/FirefoxDriverFactoryTest.java‎
Lines changed: 17 additions & 0 deletions b/‎src/test/java/com/codeborne/selenide/webdriver/FirefoxDriverFactoryTest.java‎
Lines changed: 17 additions & 0 deletions
@@ -68,6 +68,7 @@ public FirefoxOptions createCapabilities(Config config, Browser browser,
     if (!ffProfile.isEmpty()) {
       transferFirefoxProfileFromSystemProperties(firefoxOptions, ffProfile);
     }
+    injectFirefoxPrefs(firefoxOptions);
     return firefoxOptions;
   }
 
@@ -151,4 +152,22 @@ else if (isInteger(value)) {
       profile.setPreference(capability, value);
     }
   }
+
+  private void injectFirefoxPrefs(FirefoxOptions options) {
+    if (Optional.ofNullable(options.getCapability("moz:firefoxOptions")).isPresent()) {
+      Map<String, Map<String, Object>> mozOptions = (Map<String, Map<String, Object>>) options.getCapability("moz:firefoxOptions");
+
+      if (mozOptions.containsKey("prefs")) {
+        for (Map.Entry<String, Object> pref : mozOptions.get("prefs").entrySet()) {
+          if (pref.getValue() instanceof String) {
+            options.addPreference(pref.getKey(), (String) pref.getValue());
+          } else if (pref.getValue() instanceof Integer) {
+            options.addPreference(pref.getKey(), (Integer) pref.getValue());
+          } else if (pref.getValue() instanceof Boolean) {
+            options.addPreference(pref.getKey(), (Boolean) pref.getValue());
+          }
+        }
+      }
+    }
+  }
 }
@@ -164,6 +164,23 @@ void shouldNotSetupDownloadFolder_forRemoteWebdriver() {
     assertThat(options.getProfile()).isNull();
   }
 
+  @Test
+  public void injectPrefs() {
+    FirefoxOptions firefoxOptions = new FirefoxOptions();
+    firefoxOptions.addPreference("general.useragent.override", "my agent");
+    firefoxOptions.addPreference("boolean pref", true);
+    firefoxOptions.addPreference("int pref", 10);
+    config.browserCapabilities(new DesiredCapabilities(firefoxOptions));
+
+    Map<String, Object> options = driverFactory.createCapabilities(config, browser, proxy, null).asMap();
+    assertThat(options.get("moz:firefoxOptions") != null);
+
+    Map<String, Object> prefs = (Map<String, Object>) ((Map<String, Object>) options.get("moz:firefoxOptions")).get("prefs");
+    assertThat(prefs.get("general.useragent.override")).isEqualTo("my agent");
+    assertThat(prefs.get("boolean pref")).isEqualTo(true);
+    assertThat(prefs.get("int pref")).isEqualTo(10);
+  }
+
   @SuppressWarnings("unchecked")
   private Map<String, Object> prefs(FirefoxOptions options) {
     Map<String, Object> firefoxOptions = (Map<String, Object>) options.asMap().get("moz:firefoxOptions");
Original file line number	Diff line number	Diff line change
`@@ -68,6 +68,7 @@ public FirefoxOptions createCapabilities(Config config, Browser browser,`
`68`	`68`	`if (!ffProfile.isEmpty()) {`
`69`	`69`	`transferFirefoxProfileFromSystemProperties(firefoxOptions, ffProfile);`
`70`	`70`	`}`
	`71`	`+ injectFirefoxPrefs(firefoxOptions);`
`71`	`72`	`return firefoxOptions;`
`72`	`73`	`}`
`73`	`74`
`@@ -151,4 +152,22 @@ else if (isInteger(value)) {`
`151`	`152`	`profile.setPreference(capability, value);`
`152`	`153`	`}`
`153`	`154`	`}`
	`155`	`+`
	`156`	`+ private void injectFirefoxPrefs(FirefoxOptions options) {`
	`157`	`+ if (Optional.ofNullable(options.getCapability("moz:firefoxOptions")).isPresent()) {`
	`158`	`+ Map<String, Map<String, Object>> mozOptions = (Map<String, Map<String, Object>>) options.getCapability("moz:firefoxOptions");`
	`159`	`+`
	`160`	`+ if (mozOptions.containsKey("prefs")) {`
	`161`	`+ for (Map.Entry<String, Object> pref : mozOptions.get("prefs").entrySet()) {`
	`162`	`+ if (pref.getValue() instanceof String) {`
	`163`	`+ options.addPreference(pref.getKey(), (String) pref.getValue());`
	`164`	`+ } else if (pref.getValue() instanceof Integer) {`
	`165`	`+ options.addPreference(pref.getKey(), (Integer) pref.getValue());`
	`166`	`+ } else if (pref.getValue() instanceof Boolean) {`
	`167`	`+ options.addPreference(pref.getKey(), (Boolean) pref.getValue());`
	`168`	`+ }`
	`169`	`+ }`
	`170`	`+ }`
	`171`	`+ }`
	`172`	`+ }`
`154`	`173`	`}`