Pages this extension cannot modify

Due to some technical limitations of your browser, extensions (including this one) are not permitted to access or modify some pages. These include the following pages:

Internal browser pages

Internal browser pages, like the settings page, cannot be accessed or modified by browser extensions.

Pages from other extensions

Pages that are created or associated with another extension cannot be accessed or modified by browser extensions that did not create the page. For example, an extension that opens a popup window will not display the custom scrollbars you have set.

Browser operated pages

Some browsers many prevent extensions from accessing or modifying pages owned by their parent company. For example, Firefox blocks Mozilla-owned websites, Google Chrome may prevent access to Google-owned websites, and Microsoft Edge may limit access to Microsoft-owned websites.

The full list of pages that extensions cannot modify on Firefox can be found here. Other browsers do not currently have a published list of pages they prevent extensions from modifying.