X11

Table of contents:

Mouse

Swap mouse buttons

Get the ID of the device:

~> xinput list
⎡ Virtual core pointer                          id=2    [master pointer  (3)]
| ...
⎜   ↳ Logitech M705                             id=10   [slave  pointer  (2)]

Mouse button mapping is normally:

1 = left button
2 = middle button (pressing the scroll wheel)
3 = right button
4 = turn scroll wheel up
5 = turn scroll wheel down
6 = push scroll wheel left
7 = push scroll wheel right
8 = 4th button (aka browser backward button)
9 = 5th button (aka browser forward button)

So swap the buttons you'd like to. For me it was side buttons' back/forward feature. So it was only swapping 8 and 9 in the order:

xinput set-button-map 10 1 2 3 4 5 6 7 9 8 10
                      ^- This is device id