3D FlipBook - Firefox Focus override option for protecting PDF against saving & printing

The Firefox Focus browser on an Android smartphone does not seem to care about print protection in the PDF file setting: ellipses appear under the 3D flipbook (...) on the page and clicking on them opens a context menu in which it is possible not only to print the PDF file, but also to save it on your mobile phone, and then from there you can go wherever your heart desires? It's free version 1.15.2, On PC it's a different story and the plug-in works according to the settings (no print...). Can this be prevented for this and other browsers on mobile devices? Thank you.