Thank you for the review. You can get the original URL by copying the page link in the infobar. See the icon at the top right of the page when viewing a saved page. Note that you can also customize the content of the infobar (see the help page in SingleFile).

Thank you for the review. You can report bugs via the "More information" panel on the page of SingleFile.

I'm sorry about that. Note that the version 115 is quite old and that it was one of the first versions to support Web Extensions on Android. This might be the cause of the issue. The extension should work properly in more recent versions of Firefox for Android.