- Save the library file to your PC and put in your Steam\steamui\ folder.
- Download the latest version of SFP to allow for modifications of the Steam app.
- Launch the patcher and wait for it to apply the changes.
- To use it with an existing skin, add
@import url('https://rosetheflower.github.io/AdblockSteam/libraryroot.custom.css');
as its first line or along with the other imports.