When adding MailCheck to Firefox, you must consent to some permissions in order to use MailCheck.
The permissions dialog will not display all the permissions; rather, some will be summarized under "Access your data on 19 other sites". On this page, you will find information about these permissions and why they are required. By clicking on Add, you consent to the permissions and install MailCheck in Mozilla Firefox.
Mozilla Firefox itself determines the appearance of the permissions dialog window. Some of the permissions are always required for using MailCheck. However, most need to be confirmed by the user only if they are actually used. Unfortunately, the latest versions of Mozilla Firefox equally prompts all permissions when installing MailCheck, irrespective of whether they are actually used or not later on.
For each brand, there is a subpage that is used to provide updates for a particular version of MailCheck (e.g., the page dl.web.de). Unfortunately, there is no way to control whether Firefox explicitly lists these subpages in the dialog or categorizes them under the other pages.
Access to localhost is needed because the MailCheck settings in your browser are opened as a local page.
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