Hello,

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Thank you!

You appear to be posting from an iphone. Presumably that is not the problem device.

• What are you using some sort of Windows PC ? or a Mac ? for instance.
• What sort of file or content causes the problem ?

No idea if Flash content or PDF files may be involved but if they are then see

• Install the Flash plugin to view videos, animations and games
• View and edit PDF files using Firefox’s built-in viewer
• PDF files are blank or cause an error message on Mac

P.S. Latest on Firefox & iPhones | iPads

• https://blog.mozilla.org/futurereleases/2015/05/22/update-on-firefox-for-ios/

See also: https://support.mozilla.org/kb/Popular+plugins

If the above does not help, come to this post on that computer.

Type about:support in the address bar and press Enter. Under the main banner, press the button; Copy Text To Clipboard.. Then in the reply box at the bottom of this page, do a right click in the box and select Paste. This will show us your system details. No Personal Information Is Collected.