Hi I have had a look into this and have found that you will need to install an add-on. This will give your copy of Firefox for Android the ability to mange the sites that you can browse to. The best place to look is on the Firefox for Android add-ons site. You can read how to access the site and install add-ons [https://support.mozilla.org/en-US/kb/find-and-install-add-ons-firefox-android here]. Whilst there are several that are available that may help you, an example of the sort of thing that you may find useful is [https://addons.mozilla.org/en-GB/android/addon/ublock-origin/?src=hp-dl-featured uBlock Origin]. I hope that this helps, but if not, please come back here and we can look into a different solution for you.