In the latest version of Mozilla Firefox of February they have decided to introduce their own PDF viewer. Unfortunately they are having a problem with this new PDF Viewer as it can’t fill fillable PDF forms. This affects the reservation forms of the i-rent.net system, they open with the fields in blank. This problem is know with Mozilla Firefox and we hope they solve it soon.
Other browsers like Internet Explorer and Google Chrome work correct.
More information you can find here on blog.mozilla.org.
To use the previous PDF viewer you can consult this guide of Mozilla.
With kind regards,