Bonjour! A feature that allows users to disable the add-on on specific websites is on my to-do list.

In the meantime, perhaps you can use website rules to give that website a specific scrollbar appearance. For more information, see: https://github.com/WesleyBranton/Custom-Scrollbar/wiki/Using-website-rules

Glad to hear that you like the add-on. I've tested that setting on Windows and everything seems to be working properly. It could possibly be a platform-specific issue. If you could email me your operating system and Firefox version to addons@wesleybranton.com, I'd be happy to try and look into that issue.

Glad to hear that you like the add-on. I haven't had a chance to update the wiki page with information about why that new permission is required. I'm probably going to update that document later on today.

In short, this has to do with some adjustments that were made to make the add-on work properly for content that is embedded within other websites. Some older versions of Firefox will not share information about what websites are open unless they have that permission. Unfortunately, I can't apply the permission only to those versions of Firefox that need it, so I have to add that permission for every very of Firefox.

I plan on posting a more detailed explanation to the permissions page: https://github.com/WesleyBranton/Custom-Scrollbar/wiki/About-Permissions

Glad to hear that you like most of the add-on! I'd love to be able to offer more scrollbar width options, but unfortunately I'm limited to the two that Firefox supports. I'm hoping that Firefox will eventually expand the scrollbar functionality to allow the add-on to set a custom width, as is currently possible on other browsers.