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You can definitely do that for Chrome extensions, not sure about Firefox. https://developer.chrome.com/extensions/override https://developer.chrome.com/extensi

• kuschku 10y ago
  > Not sure why you'd want to replace the backend, this could break other extensions. Both WebExtensions and Chrome extensions allow changing/deleting browser history items, which should enable most things extensions would want to do. As I said above, the whole point is to do my own history tracking system, which stores history via a sync system of my own, in a server of my own. And loads it from there, too. The user has a webinterface, mobile interface, app integration with browsers, etc. You can easily do fulltext search of all sites you’ve ever visited, etc. "Breaking" other extensions is intentional – I want to replace the backend in which they search. I want to provide far more than what any of these browsers provide, although Vivaldi is still the closest yet.