Could it be that you are using Firefox in 'private mode'? If so please try to reload the page in normal mode. Our app does not work in private mode as the IndexedDB is not supported in private mode.

Or did you disable the history of visited websites?
To check, please go to 'File' -> 'Preferences' -> 'Privacy & Security' (or depending on your Firefox version: 'Tools' -> 'Options' -> 'Privacy & Security') and review your 'History' settings.

If you don't want to work without private mode please use Chrome as browser. Chrome does support the Browser DB even if in private mode.

If you are using a recent version of Firefox, Chrome, Internet Explorer or Safari and still see this warning please contact us so we can debug this error.

It looks like you are using Android. Sadly the support for the IndexedDB on Android devices isn't yet reliable.