White on white icons on app page in FireFox

[rullzer]

The filter magic introduced in #834 does not work on FireFox

Chrome:

FF:

Since it is backported to stable10 (#897) we should fix this ASAP!

@raghunayyar @MorrisJobke @jancborchardt

[rullzer]

Ok step closer... now it looks like

[rullzer]

Ah apparently it is failing because the icons don't have a viewbox defined.

[rullzer]

ah no... browsers...

[LukasReschke]

Can you also test with IE and Edge?

[MorrisJobke]

Can you also test with IE and Edge?

I will do so

[MorrisJobke]

• Edge all icons look good, except the "default encryption app" one - there the icon is not properly centered
• IE 10 - the app management only shows the first app and no other ones (but also without any icon or space for that icon)