Can you give me more details to solve your problem?

To update the Firefox app on your mobile device, follow these steps based on your operating system: For Android:

   Open the Google Play Store:
       Locate the Play Store app on your device and tap to open it.

   Search for Firefox:
       In the search bar, type "Firefox" and select the Firefox app from the search results.

   Update the App:
       If an update is available, you will see an "Update" button. Tap on it to download and install the latest version.
       If you see "Open" instead, it means you are already using the latest version.

For iOS (iPhone/iPad):

   Open the App Store:
       Locate the App Store app on your device and tap to open it.

   Go to Updates:
       Tap on your profile icon in the top right corner of the screen.
       Scroll down to see available updates.

   Update Firefox:
       If Firefox appears in the list of apps with available updates, tap the "Update" button next to it.
       If you don’t see Firefox listed, it means you are already using the latest version.

Automatic Updates:

To ensure that your apps, including Firefox, are always up to date, you can enable automatic updates:

   For Android:
       Open the Google Play Store, tap on your profile icon, go to "Settings," then "Network preferences," and select "Auto-update apps." Choose your preferred option.

   For iOS:
       Go to "Settings," scroll down to "App Store," and toggle on "App Updates" under the Automatic Downloads section.

Update my phone to latest version of mozella

https://support.mozilla.org/en-US/kb/update-latest-version-firefox-android