Greasy Fork is available in English.
Hide specified works on AO3
Currently it won't work on mobile.
Firefox is the only mobile browser which allows addons, and only on Android, and even then only few addons are supported as of a recent update (see: https://support.mozilla.org/en-US/questions/1102830, https://blog.mozilla.org/addons/2020/02/11/faq-for-extension-support-in-new-firefox-for-android/). Tampermonkey is not supported, so you won't be able to use this or any other userscript. Hopefully a future version of mobile Firefox will support Tampermonkey.
does this work on mobile? do i have to do something for it to work on mobile?