[Firefox for Android] Can't add a custom filter from a file

[alexx7311]

AdGuard Extension version

4.2.209

Browser version

Firefox nightly for Android

OS version

Android 13

What filters do you have enabled?

No response

What Stealth Mode options do you have enabled?

No response

Issue Details

STR:

1. Download https://easylist.to/easylist/fanboy-social.txt to your device and copy the path to the file.
2. Go to AdGuard settings > Filters > Custom > Add custom filter
3. Paste the file path and click 'Next'.

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Expected Behavior

No response

Additional Information

No response