# Checking the extension

> **If** `ChromeNativeMessaging` is not running:
1. In Mozilla Firefox, go to **about:addons > Extensions**.
2. Remove the UiPath extension manually by clicking the **Remove** button.
3. Reinstall it as explained [here](https://docs.uipath.com/studio/standalone/latest/user-guide/extension-for-firefox).

## Check if the UiPath Extension for Firefox is installed and enabled
1. In Mozilla Firefox, go to **about:addons > Extensions**.
2. If the extension is not present, install it as explained [here](https://docs.uipath.com/studio/standalone/latest/user-guide/extension-for-firefox).
3. Make sure the UiPath Extension is updated to the latest version.

## To prevent possible issues
1. In Mozilla Firefox, go to **about:addons > Extensions**.
2. Open Task Manager or Process Explorer.
3. Check if the `ChromeNativeMessaging.exe` process is running.
   :::note
   A separate `ChromeNativeMessaging` instance is running for the Chrome extension, so you need to close Google Chrome when performing this check.
   :::

**If** `ChromeNativeMessaging` is not running:
1. In Mozilla Firefox, go to **about:addons > Extensions**.
2. Remove the UiPath extension manually by clicking the **Remove** button.
3. Reinstall it as explained [here](https://docs.uipath.com/studio/standalone/latest/user-guide/extension-for-firefox).

In case the above information did not solve your issue, you can try getting additional information by viewing traces and analyzing the errors thrown by the UiPath extension. The following are types of traces you can collect and analyze:

## For the general extension traces in Mozilla Firefox

Go to **Open menu > Web Developer > Browser Console** (Ctrl+Shift+J). The **Browser Console** is displayed. All the errors generated by the extension are displayed here.

## For traces generated by the web page you want to automate

Go to **Open menu> Web Developer > Web Console** (Ctrl+Shift+K). The **Web Console** is displayed. All the errors for the current web page are displayed here.

## For full traces, (not only errors) do the following
1. Open the Registry Editor.
2. Navigate to the `HKEY_CURRENT_USER\SOFTWARE\UiPath` key.
3. Double-click the **WebExtensionTrace** REG_DWORD value. The **Edit DWORD Value** window is displayed.
4. In the **Value Data** field, change the value to **1**, and click **OK**. The value is saved.
   :::note
   If the `WebExtensionTrace` REG_DWORD value does not exist, you have to create it, by right-clicking the right panel, selecting **New > DWORD (32-bit) Value**, and providing the values mentioned above.
   :::

## Check if there is some data missing in the Registry Editor
1. Open the Registry Editor.
2. Navigate to the `HKEY_CURRENT_USER\SOFTWARE\Mozilla\NativeMessagingHosts\com.uipath.chromenativemsg` key.
3. Open the `(Default)` REG_SZ value. The **Edit String** window is displayed and should contain a path similar to `C:\Users\YOUR_USER_NAME\AppData\Local\UiPath\uipath-ff.json`.
4. Open the .json file at the path found above with a text editor, such as Notepad++.
5. Check that the **path** property correctly points to where `ChromeNativeMessaging.exe` is located, similar to `C:\Program Files (x86)\UiPath Studio\UiPath\BrowserExtension\ChromeNativeMessaging.exe`.