doesn't look inactive to me (personally).

Blue underline, well that's pretty straight forward. And then the darker background to show it has been clicked on.

@C-Lodder its also my personal Feeling, cause i have to "think" what is active. Lok at Tabs in Firefox:

@ciar4n thoughts?

The current design is influenced by Googles tabs... http://materializecss.com/tabs.html

It does go away from the traditional tabs which everyone is familiar with however the current (Google influenced) is increasingly becoming an accepted alternative.

@ciar4n Tabs-Color look all same, Difference is Line under active Tab. That looks clear.

@franz-wohlkoenig Presuming I understand you correctly do you think this would be better....

Or simply...

if you go with http://materializecss.com/tabs.html then:

As the tabs are in a header, with a background, they're more boxed in, therefore using a line only won't be as visible. The "line only" will only work well when the tabs are more free:

UIKit 3.0 example: https://getuikit.com/docs/tab

@C-Lodder so inactive Tabs should have darker Background.

not necessarily "should" :) Different software/sites will vary.

cc'ing UX team to see what they have to say:

@cpfeifer @artisanwebandprint @BrittaStender

The difference is subtle. In 3.x the active tab has a white or transparent border which blends with the content background, giving it the appearance of being part of the active content window while the others have a bottom border. That's what makes it pop out a bit more.

I do like the blue highlight border, but a border creates separation between the content and the active tab, and that's why the "active tab" effect seems diminished here.

We could tinker with this. I don't think it needs a major adjustment, but a subtle accent of some kind could help. Just thinking out loud, maybe the blue goes to the top and the tab is white while the others are darker, or maybe a shadow or border highlight around the active tab to help it stand out. I think it's okay, but a simple touch of some kind could make a difference.

I see no issue with this at all.

The active tabs are slightly greyed with a nice underline of blue which shows it is active and the line shows there is more content below which as it's completely new content it is. Thus being perfectly valid.

@franz-wohlkoenig - what's happening with this? Still an issue for you? If so, would you be able to make a PR?

not an Issue if for others okay.