Hi there! I understand that you're experiencing an issue with the Friendly Social Browser crashing when you try to download something on Facebook. Let's work through this together.

1. Update the App: First, please check if there’s an update available for the Friendly Social Browser. Sometimes, bugs get fixed in new versions. To check for updates, follow these steps:
- Open the App Store on your iPhone.
- Tap on your profile picture in the top right corner.
- Scroll down to see if Friendly Social Browser is listed with an "Update" option.

2. Restart the App: If the app is already updated, try closing it completely and then reopening it:
- Swipe up from the bottom of the screen and pause (for iPhones without a Home button) or double-click the Home button.
- Find the Friendly Social Browser app and swipe it up to close it.
- Reopen the app and see if the issue persists.

3. Clear Cache/Reset the App: Unfortunately, there isn’t a direct way to clear the app cache on iOS like on other platforms, but you can try resetting the app settings if that option is available within the app's settings.

4. Reinstall the App: If the issue continues, consider uninstalling and reinstalling the app:
- Press and hold the Friendly Social Browser app icon until you see the options.
- Select "Remove App" and confirm.
- Go to the App Store, search for Friendly Social Browser, and reinstall it.

5. Check Facebook Settings: Sometimes, Facebook’s settings can affect how Third-party browsers work. Ensure that there are no restrictions or permissions denying downloads via Friendly.

If the problem still occurs after these steps, it might be worth checking for any widespread issues related to Facebook itself that could be causing the crashes. Some users have reported similar problems lately, which could indicate a broader issue not specific to your device.

If you need more detailed assistance, please let me know how these steps go! Are you satisfied with the solutions I provided?