I can see why Chromium-based browsers such as Vivaldi (non-opensource) are increasingly baking in features of popular extensions into the browser (ad-blocker, d

I can see why Chromium-based browsers such as Vivaldi (non-opensource) are increasingly baking in features of popular extensions into the browser (ad-blocker, dark mode). First, there's the risk of Chrome Web Store simply not being available to non-Chrome flavours. Next, the extensions APIs and ecosystem could head in any direction Google wants. I use about 6 extensions, 3 of them self-compiled and sideloaded (JSON Viewer, Dark Reader, Violentmonkey). I wish services like Pushbullet would open-source their browser extension. Isn't all the secret sauce on the server-side anyway?