When I am on Firefox, I would like the space bar to scroll not the whole page but only half of it in order not to lose focus when I read.
I suppose there must be an easy workaround by changing a value in
about:config but I can't find it. Or maybe with some Greasemonkey custom script, but I am kind of a noob.
There is also the "Scroll Half Page" extension on the Chrome Web store, could that be easily adapted?
I am on Linux Mint 19.1 with the latest version of Firefox.