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Can anyone recommend a post that introduces these kind of issues for Android outsiders?

I assumed Android ROMs carry a fully fledged distribution, including the kernel and firmware. Sure, the latter might be out of date.

When I tried digging into the question "where does this so-called open source come from", I stumbled upon Kernels that basically have one commit adding the whole blob.

Is the ROM merely the application software built for a target kernel (which is persistent on the device)?

I've hacked around with Kernel modules on Android before, but miss the big picture in that regard.

Edit: especially the new update infrastructure (treble?), Does it change anything here?

Same here. The URL bar matches quite good most of the time, so it's more an omni-bar. If I need something, I type it in and it suggests me the page. Having the tab open will suggest me that tab.

But having so many tabs open makes the tab UI useless, so I prefer to close them.

Since you seem to store everything on various Google services, what is your backup strategy in case you loose access to your account?

We're talking about marketing here, and if something leaves you with an odd feeling, it's no good marketing.

I must say as a non-native, I didn't knew gimp before and was not offended. Googling in incognito mode, I can absolutely see why people might want to avoid that.