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That menu is populated by your OS, not by Firefox. Any application can implement intent ACTION_PROCESS_TEXT ( https://developer.android.com/reference/android/content/Inte... ) to appear in the text selection menu.

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Thank you so much, I found the evildoer. Now I feel stupid. I hope this will be a lesson for future me, to calm down and investigate a bit more before randomly accusing the first scapegoat.

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