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Re:Firefox 75.0 by chungy on Friday April 10, 2020 @08:51AM (#22832503)
It's a feature I absolutely depend on, I can't even imagine being productive without it.

At any rate, if you use GNOME, you can disable it. Open Tweaks, go to "Keyboard & Mouse" and disable "Middle Click Paste"

Re:Firefox 75.0 by coldpie on Friday April 10, 2020 @08:55AM (#22832533)
Oh trust, me I've tried. That setting only affects Gnome/GTK applications. Some applications that use other toolkits, or no toolkit, have direct support for middle-click paste, which then can't be disabled at all. It's just a platform convention I dislike; I know it won't be going away.
Re:Firefox 75.0 by j-james on Friday April 10, 2020 @05:17PM (#22837450)
XMousePasteBlock is apparently effective.

It keeps the primary clipboard clear, so it should also work for non-GTK applications.

https://github.com/milaq/XMousePasteBlock

Re:Firefox 75.0 by woodrowbarlow on Friday April 10, 2020 @10:22AM (#22833287)
i actually like middle-click paste, but there's no denying that having two distinct OS-level copy/paste buffers with subtly different semantics is a rough edge.