Firefox Native Scrollbars - The Hard Way

Hello, here's something I made for my own personal use that I thought people here would appreciate.

Since Firefox 97, it has been impossible to use the pseudo-native scrollbars that Firefox had from the beginning. There have been attempts at solving this using CSS, but the only perfect solution I saw would be to modify Firefox's source code in order to reintroduce the native scrollbars directly. This wasn't all that difficult, since the way scrollbars work never really changed.

However, I'm not really a fan of source code modifications and try to avoid them because the forking can become a bit of a mess. I really tried to get something working with Windhawk, but since the symbols from Firefox's symbol server are so massive (~1.19 GB), Windhawk kinda just refused to work with them. So I settled on a source code mod, and I'm kind of glad that I did, because I really didn't know anything about the Gecko architecture going into this.

Unfortunately, this mod does mean that you must disable updates. You will also only be able to use exactly Firefox ESR 115.3.1 at the moment, which fortunately is the latest version at the time of writing.

Alas, here is it in action: