I've encountered an app which adds itself to the global Android context menu. The entry has even overtaken native Firefox options in the past and currently slows down my workflow in every app where the context menu is relevant. I may also want to remove some other options such as 'cut' (for text).
Suggesting to uninstall this specific app isn't an answer. Using ADB is fine. I'm rooted if that's a necessity.
Intent.ACTION_PROCESS_TEXTshould be the culprit. However, I haven't researched if it's possible to block/disable it as an end-user.