There should be a way to allow extensions to execute only on specific websites like the Site access option in Edge does, this improves extensions usability and may also enhance privacy.
While this suggestion is about running add-ons only on a named list of sites, it would also be useful to have the ability to run add-ons on any site except for those on a named list.
For example, For security reasons a user might not want any add-ons to run on their bank's website, but would otherwise want add-ons to run on websites in general.
Or an add-on might not work well on a specific site, but provide no native way in its options to auto-deactivate itself just for that site.
So, as well as creating an option for 'run only on these sites', it would be useful to also have a 'run on all sitese except for these' option, for individual add-ons.