Thanks for the report. Sorry, but I don't know of a solution for this problem. Do any other web sites cause the same problem? Do you have any other Android devices that can run Firefox and connect to this site? If you have time to provide us with more information that might help, you can create an account and file a bug report here: https://bugzilla.mozilla.org/ You can also uninstall the beta version and try a nightly build from here, to see if your issue is fixed in our more recent development: https://wiki.mozilla.org/Mobile/Platforms/Android