Unfortunately, Firefox currently has very limited support for adjusting scrollbar widths. I'd love to expand the options available for that when more options are added to Firefox.

As for customizing this page, that's a restriction Firefox has for all add-ons. There are some protected pages (such as internal browser settings pages or Mozilla-owned pages), which add-ons are not allowed to edit. The intention is to prevent add-ons from injecting false or dangerous information on the pages, but it also means that the Custom Scrollbars add-on can't modify the scrollbars on this page.

Hallo! Unfortunately, Firefox only offers limited support for scrollbar widths and wide is not currently an option. I'd love to add that option in the future, if it ever becomes available on Firefox.

Sorry to hear the add-on isn't working for you. If you send me and email at addons@wesleybranton.com with a description of the issue, what website(s) is not working and what settings you are using (or a copy of the backup file from the add-on), I'd be happy to take a look.

Glad to hear you like the add-on. As of the latest update, most of the tabs should take the changes without having to be reloaded. The reload warning on the settings page has been left there as a precaution to make sure that the changes made actually work as intended. It should be removed in a future version.

Thanks for the feedback! Sorry to hear you are having issues. I'd love to take a look into the Magic Mouse issue for you, although it may be difficult since I don't have a Mac.

If you could either file a bug report on GitHub (https://github.com/WesleyBranton/Custom-Scrollbar/issues/new) or email me at addons@wesleybranton.com with more information, it would be much appreciated. It's helpful if you include your current settings and, if the issue is with a specific website, the URL for that website. Thanks!

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.