You will need to install a user script manager extension to install this script.
Google display results now in 3 columns based on the userstyle https://userstyles.org/styles/123849/google-search-in-columns
Since GoogleMonkeyR is all messed up I decided to check for a way to get the 3 columns result which is the feature I use the most.
If you want more or less columns change the number 3 to whatever number you want on the line "width: calc(100% / 3 - 2.333em) !important;",
I recommend using it alongside https://addons.mozilla.org/en-US/firefox/addon/searchpreview/