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Mozilla Welcomes Anonym: Privacy Preserving Digital Advertising
(blog.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
What are you going to use outside of the add-on store? At the end of the day no ones going to move unless they do something really bad.
Userscripts, usually from greasyfork. Some popular extensions can be installed as userscripts (not ublock or umatrix unfortunately, though in the case of qutebrowser it's own internal tooling can be configured to fit these usecases to some degree).