trefle.io has data from various sources, though a lot of pages are rather empty.

Onlyoffice runs in a browser: https://www.onlyoffice.com/presentation-editor.aspx

Sadly KDE is also trying out the "modern" style tabs in some places too:

Right, that makes sense as well. What I was thinking is that the use of the accent colour shows which one is active, though it would probably be less confusing if this wasn't done with an outline. See the KDE version for example:

Regarding keyboard navigation, I could see this working similarly to radio buttons, where the tab key selects the entire tab group, and tabs need to be navigated using the arrow keys. In this case I think it makes sense to put the focus border around only the selected option, and having the focus border follow the selected option when arrow keys are used. If this is the case, I think swapping the current version does make sense.

If they did the exact opposite of this, I think it would look ok. If I was trying to fix this, I would probably just swap the styles of the selected and deselected states. Maybe it's a miscommunication between designers and implementers, causing the meanings to be swapped?

What's wrong with forms?

I use LeechBlock NG. It has many different blocking options, including greyscale, or a countdown before the page loads.

You can use command line arguments for minetest to bypass the built in menu. You could then re-implement all menu features yourself.

It's gradually getting there. The settings redesign was introduced a few versions ago, and the online content menu redesign will hopefully land in the next version (and potentially replace the current content tab after that). I agree that the main menu redesign might be a while away though.

I believe it is the implementation of the tick system in Mesecons (which VoxeLibre redstone is based on) that is the issue, and I agree it makes it nearly useless. It is absolutely an issue with the mod, not the engine, but would probably require a big rewrite of the mod to fix (not that I'm familiar with the actual implementation of mesecons).

I believe birds have a very different perspective of harmonisation. What they sing might sound harmonised to them, but not to us (and vice versa).

No, it means people can contribute issues and pull requests to projects on other servers. Repositories would only be created on the server your account is on if I'm not mistaken. I believe it uses activitypub internally, so should work the same as Lemmy/mastodon.