Chrome : https://chrome.google.com/webstore/detail/tampermonkey/dhdgffkkebhmkfjojejmpbldmpobfkfo
Firefox : https://addons.mozilla.org/en-US/firefox/addon/greasemonkey/
click one *.user.js file,then click Raw at the right top corner,wait.
add the script you clicked to your Greasemonkey or Tampermonkey.