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For disabling X11 middle click paste, I found an interesting SO post but the best answer I saw and tested myself and it works, was the one by Suraj Inamdar abou

For disabling X11 middle click paste, I found an interesting SO post but the best answer I saw and tested myself and it works, was the one by Suraj Inamdar about one third of the way down the page: https://unix.stackexchange.com/questions/24330/how-can-i-turn-off-middle-mouse-button-paste-functionality-in-all-programs https://unix.stackexchange.com/questions/24330/how-can-i-tur... What sucks is I use middle click paste all the time so now I'll have to decide if I want to leave it disabled for potentially improving security.

joveian 3y ago
That removes your middle mouse button entirely! (Unreliably due to the use of numbers with xinput, which can change; xinput can take names to avoid that issue). The issue will remain if the primary selection is pasted into a terminal by other means (personally, I use a key combination rather than mouse button) and won't be an issue if clipboard.autocopy is set to false in about:config in Firefox (per torgard's comment). I've also set dom.event.clipboardevents.enabled to false since I don't want websites messing with the clipboard.