Hi You may be able to watch videos and other media content in Private Browsing mode, but you may find that the third party tracking elements may need to be turned on. You can read more [https://support.mozilla.org/en-US/kb/private-browsing-firefox-android here]. Please note that your internet service provider may block some content by default. I recomend contacting them diretly for help with this issue in the first instance.